Safety protection method of highway variable information sign system

Abstract

The invention relates to the technical field of expressway variable information safety, in particular to a safety protection method for an expressway variable information sign system, and the method comprises the steps: obtaining the display state of each LED lamp on each LED display sign in the expressway variable information sign system in real time; each influence parameter influences the information content on each LED display sign; determining the association strength of various display combinations on each LED display sign and each influence parameter; obtaining the time dimension receivability of the current display combination on each LED display sign; determining an influence coefficient between each LED display sign and the adjacent LED display sign; and obtaining a display coefficient of the current display combination of each LED display sign, and performing safety judgment on the current display combination of each LED display sign. According to the invention, the safety and accuracy of the display combination of each LED display sign are improved.

Description

Technical Field

[0001] The present application relates to the technical field of variable information safety on expressways, and in particular to a safety protection method for a variable information sign system on expressways. Background Art

[0002] Highway variable information signs are electronic display devices used to publish traffic information in real time. There are various types, including gantry variable information boards, F-type variable information boards, LED variable information signs, etc. Among them, LED variable information signs use LED light-emitting diodes as display units, with the characteristics of high brightness, wide viewing angle, flexible display content, etc. They are suitable for information release under severe weather conditions and are an important part of highway variable information sign systems.

[0003] The display content of each LED display sign is often released by the central control system based on real-time traffic conditions, road conditions or special instructions. The central control system generates corresponding instructions based on the collected traffic data and transmits these instructions to each LED display sign through the network. These instructions are usually transmitted using encryption technology to ensure that the information is not tampered with or leaked during transmission. After the LED display sign receives the instruction and decrypts it, the display status of each LED light on the LED display sign is adjusted according to the decrypted content.

[0004] At present, after receiving the instruction, each LED display sign directly displays according to the decrypted content, without considering the historical performance of each LED display sign and the changes in the surrounding environment. If some instructions are no longer available due to equipment failure, network delay or changes in surrounding traffic conditions, and the display content is not corrected in time, the information will be inaccurately transmitted, reducing road safety. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a safety protection method for a variable information sign system on a highway to solve the existing problems.

[0006] The safety protection method of a highway variable information sign system of the present application adopts the following technical solution:

[0007] An embodiment of the present application provides a safety protection method for a highway variable information sign system, the method comprising the following steps:

[0008] Real-time acquisition of the display status of each LED light on each LED display sign in the highway variable information sign system; real-time acquisition of various influencing parameters affecting the information content on each LED display sign; recording the display status of all LED lights on each LED display sign as a display combination;

[0009] Analyze the correlation between each historical display state of each LED lamp on each LED display sign and each influencing parameter, and determine the consistent correlation between various display states of each LED lamp on each LED display sign and each influencing parameter;

[0010] The consistent correlation between various display states of all LED lights on each LED display sign and various influencing parameters is integrated to determine the correlation strength between various display combinations on each LED display sign and various influencing parameters;

[0011] Analyze the difference between the influencing parameters of the current display combination on each LED display sign and the previous display combination, and obtain the acceptability of the time dimension of the current display combination on each LED display sign in combination with the correlation strength;

[0012] Determine the influence coefficient between each LED display sign and its adjacent LED display sign based on the distance relationship between each LED display sign and its adjacent LED display sign, and the consistency degree of each historical display combination;

[0013] By using the influence coefficient between each LED display sign and its adjacent multiple LED display signs, as well as the consistency of the current display combination, combined with the acceptability of the time dimension, the display coefficient of the current display combination of each LED display sign is obtained, and a safety judgment is made on the current display combination of each LED display sign.

[0014] In one embodiment, the display status includes: off, red, green, and yellow.

[0015] In one embodiment, the influencing parameters include: temperature, humidity, rainfall, traffic volume, wind speed, and visibility.

[0016] In one embodiment, the determination of the consistent correlation includes:

[0017] Obtain a preset number of display combinations of each LED display sign before the current display combination, and the calculation method of the consistent correlation is:

[0018] In the formula, is the consistent correlation between the jth display state of the i-th LED light on each LED display sign and the K-th influencing parameter, exp[] is an exponential function with a natural constant as the base, is the number of times the i-th LED light in the preset number of display combinations of each LED display sign appears in the j-th display state, FK tis the value of the Kth influencing parameter when the jth display state of the ith LED lamp on each LED display sign appears for the tth time in the preset number of display combinations, and μ is the average value of the Kth influencing parameter when the jth display state of the ith LED lamp on each LED display sign appears all times in the preset number of display combinations.

[0019] In one embodiment, the determination of the association strength includes:

[0020] For any display combination on each LED display sign, the cumulative sum of the consistent correlations between the display states of all LED lights and any influencing parameter is calculated, and the normalized value of the cumulative sum is used as the correlation strength between the any display combination on each LED display sign and the any influencing parameter.

[0021] In one embodiment, the time dimension acceptability is calculated as follows:

[0022] In the formula, is the time dimension acceptability of the current display combination on each LED display sign, FK0 is the current value of the Kth influencing parameter, FK1 is the value of the Kth influencing parameter when the previous display combination of the current display combination on each LED display sign was received, X[H] K is the correlation strength between the current display combination on each LED display sign and the Kth influencing parameter, M is the number of influencing parameters, and ε1 is a preset value greater than 0.

[0023] In one embodiment, determining the influence coefficient includes:

[0024] Calculate the metric distance between each LED display sign and its adjacent LED display sign, use the opposite of the metric distance as the exponent of an exponential function with a natural constant as the base, record it as a first exponential function, calculate the consistency coefficient of each LED display sign and its adjacent LED display sign in the preset number of display combinations for each display combination, calculate the mean of the consistency coefficients of the preset number of display combinations, and the influence coefficient is the product of the calculation result of the first exponential function and the mean; wherein, when the display combination between each LED display sign and its adjacent LED display sign is exactly the same, the consistency coefficient is 1, otherwise, the consistency coefficient is 0.

[0025] In one embodiment, the determination of the display coefficient includes:

[0026] For two non-adjacent LED display signs B and C, the fusion influence coefficient between the LED display sign B and the LED display sign C is calculated by using the influence coefficients of all any two adjacent LED display signs between the LED display sign B and the LED display sign C;

[0027] Based on the consistency between the fusion influence coefficient and the current display combination of the LED display signs, combined with the time dimension acceptability, the display coefficient of the current display combination of each LED display sign is calculated, and the expression is:

[0028] In the formula, is the display coefficient of the current display combination of each LED display sign, is the time dimension acceptability of the current display combination on each LED display sign, C is the preset number of adjacent LED display signs of each LED display sign, is the fusion influence coefficient of each LED display sign and its adjacent vth LED display sign, is the consistency coefficient of the current display combination of each LED display sign and its adjacent vth LED display sign.

[0029] In one embodiment, the fusion influence coefficient is the cumulative multiplication result of the influence coefficients of all any two adjacent LED display signs between the LED display sign B and the LED display sign C.

[0030] In one embodiment, the step of making a safety determination on the current display combination of each LED display sign includes:

[0031] When the normalized value of the display coefficient of the current display combination of any LED display sign is greater than a preset threshold, the current display combination of any LED display sign is determined to be safe and displayed; otherwise, the current display combination of any LED display sign is determined to be unsafe and not displayed.

[0032] This application has at least the following beneficial effects:

[0033] The present application obtains the display status of each LED light on each LED display sign in the variable information sign system of the highway in real time; obtains the influencing parameters that affect the information content on each LED display sign in real time; records the display status of all LED lights on each LED display sign as a display combination; analyzes the correlation between each historical display status of each LED light on each LED display sign and the influencing parameters, and determines the consistent correlation between various display states of each LED light on each LED display sign and each influencing parameter; the consistent correlation reflects the degree of association between various display states of each LED light on the LED display sign and each influencing parameter, thereby improving the reliability of the determination of various display states of each LED light; integrates the consistent correlation between various display states of all LED lights on each LED display sign and each influencing parameter, and determines the correlation strength between various display combinations on each LED display sign and each influencing parameter; the correlation strength reflects the correlation between various display combinations on each LED display sign and each influencing parameter. If there is a greater correlation strength between a display combination and an influencing parameter, it means that the display combination is more likely to be caused by the influencing parameter; further, analyzes the correlation between the various display states of each LED display sign and each influencing parameter. The difference between the previous display combination and the influencing parameters of the previous display combination is combined with the association strength to obtain the time dimension acceptability of the current display combination on each LED display sign; the time dimension acceptability reflects the safety level of the current display combination on each LED display sign; the accuracy of the display combination safety judgment is improved; based on the distance relationship between each LED display sign and its adjacent LED display sign, and the consistency of each historical display combination, the influence coefficient between each LED display sign and its adjacent LED display sign is determined; the influence coefficient reflects the unified change relationship of the display combination between adjacent LED display signs, avoiding errors in the display combination safety judgment of a single LED display sign; through the influence coefficient between each LED display sign and multiple adjacent LED display signs, and the consistency of the current display combination, combined with the time dimension acceptability, the display coefficient of the current display combination of each LED display sign is obtained, and the current display combination of each LED display sign is safely judged, thereby improving the safety, accuracy and effectiveness of the display combination on each LED display sign, and providing more accurate reminder information for highway traffic. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A flowchart of the steps of a safety protection method for a variable information sign system on a highway provided in this application;

[0036] Figure 2 A flow chart is provided for display coefficient determination. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the safety protection method of a variable information sign system for a highway proposed in the present application, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0038] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0039] The specific scheme of the safety protection method of a variable information sign system for a highway provided by the present application is described in detail below with reference to the accompanying drawings.

[0040] An embodiment of the present application provides a safety protection method for a variable information sign system on a highway. Specifically, the following safety protection method for a variable information sign system on a highway is provided. Figure 1 , the method comprises the following steps:

[0041] Step S001, real-time acquisition of the display status of each LED lamp on each LED display sign in the highway variable information sign system; real-time acquisition of various influencing parameters affecting the information content on each LED display sign; and recording the display status of all LED lamps on each LED display sign as a display combination.

[0042] On highways, in order to help drivers better cope with complex traffic environments, improve traffic safety, reduce accident rates, improve road efficiency, and respond promptly in emergencies, multiple LED display signs will be set up on highways. They can provide flexible instructions and warnings based on real-time traffic and road condition changes.

[0043] In this embodiment, the number of LED lights included in each LED display sign on the highway is recorded as N. For each LED light on each LED display sign, the display status includes: off, red, green, and yellow, that is, four display states. This embodiment monitors the display status of each LED light on each LED display sign on the highway in real time; in addition, the central control system of the highway obtains in real time the various influencing parameters that affect the information content on each LED display sign. In this embodiment, the various influencing parameters include: temperature, humidity, rainfall, traffic flow, wind speed, and visibility. The implementer can set the type and number of influencing parameters by himself, and this embodiment does not limit this. The combination of the display status of all LED lights when each LED display sign receives an instruction each time is recorded as a display combination.

[0044] It should be noted that the display status of each LED light and the values ​​of each influencing parameter are collected synchronously and at the same frequency. In this embodiment, the collection time interval is 0.1s, and the implementer can set it according to the actual situation.

[0045] Step S002, analyzing the correlation between each historical display state of each LED lamp on each LED display sign and each influencing parameter, and determining the consistent correlation between each display state of each LED lamp on each LED display sign and each influencing parameter.

[0046] For the convenience of statistics, this embodiment records the display status of each LED light on each LED display sign as 0 for "off", 1 for "red", 2 for "green", and 3 for "yellow", and obtains a preset number of display combinations before the current display combination of each LED display sign as historical data for analysis of each LED display sign.

[0047] It should be noted that, for the preset number of display combinations, each time the LED display sign changes the display content is recorded as 1 time, and the preset number is recorded as W. In this embodiment, W=50. The implementer can set it according to the actual situation, and this embodiment does not limit it here.

[0048] Since the display content of the LED display sign is related to each influencing parameter, and the LED display sign is composed of N LED lights, the display state of each LED light is also related to each influencing parameter. When analyzing the relationship between the display state of each LED light and the influencing parameter, if the LED light is in display state 1, and the value of the influencing parameter X changes relatively smoothly, then the correlation between display state 1 and the influencing parameter X is usually higher, where the influencing parameter X is any one of temperature, humidity, rainfall, traffic flow, wind speed, and visibility. The reason is that when the influencing parameter X remains stable, the display state of the LED light will also remain unchanged, indicating that there is a stable association between them, and the stable state reduces the influence of external interference and other factors, so that the display state change of the LED light is mainly controlled by the influencing parameter X, rather than other influencing parameters. This stable correlation strengthens the causal relationship between the two and further improves their correlation.

[0049] Based on the above analysis, this embodiment calculates the consistent correlation between various display states of each LED light on each LED display sign and various influencing parameters. The specific calculation method is:

[0050] In the formula, is the consistent correlation between the jth display state of the i-th LED light on each LED display sign and the K-th influencing parameter, exp[] is an exponential function with a natural constant as the base, is the number of times the i-th LED light in the preset number of display combinations of each LED display sign appears in the j-th display state, FK t is the value of the Kth influencing parameter when the jth display state of the i-th LED lamp on each LED display sign appears for the tth time in the preset number of display combinations, and μ is the average value of the Kth influencing parameter when the jth display state of the i-th LED lamp on each LED display sign appears for all times in the preset number of display combinations. t -μ| is recorded as the first difference.

[0051] It should be understood that, when the first difference is larger, it indicates that the variation range of the value of the Kth influencing parameter is larger, reflecting that the correlation between the jth display state of the LED lamp and the Kth influencing parameter is poor, and therefore, the consistent correlation is smaller.

[0052] Step S003: integrating the consistent correlations between various display states of all LED lights on each LED display sign and various influencing parameters, and determining the correlation strengths between various display combinations on each LED display sign and various influencing parameters.

[0053] Since the LED display sign is composed of N LED lights, and the display state of each LED light is part of the overall display content of the LED display sign, each LED display combination does not only depend on the display state of a single LED light, but is a combination of the display states of all LED lights on the LED display sign.

[0054] Therefore, this embodiment integrates the various display states of all LED lights on each LED display sign with the consistent correlation of each influencing parameter, which helps to improve the accuracy of the overall correlation determination of the LED display sign. Since the display state change of a single LED light may be affected by noise or other interference factors, the consistent correlation of all LED lights can better eliminate these noises and obtain a stable and reliable overall correlation measurement.

[0055] Based on the above analysis, the correlation strength between various display combinations on each LED display sign and each influencing parameter is calculated. The specific calculation method is:

[0056] Where XA K is the correlation strength between the Ath display combination on each LED display sign and the Kth influencing parameter, Norm() is the normalization function, N is the number of all LED lights on each LED display sign, It is the consistent correlation between the display state of the i-th LED lamp in the A-th display combination on each LED display sign and the K-th influencing parameter.

[0057] Step S004, analyzing the differences in the influencing parameters between the current display combination on each LED display sign and the previous display combination, and combining the correlation strength to obtain the acceptability of the time dimension of the current display combination on each LED display sign.

[0058] When analyzing the safety of instructions received by LED display signs, the stability and accuracy of LED display signs depend on the smooth changes of influencing parameters. If the difference in influencing parameters between adjacent display combination changes is small, the central control system of the highway can respond to the changes more smoothly, avoid over-adjustment or mis-reaction, and thus ensure the consistency and accuracy of the displayed content. Therefore, the difference between the current display combination of the LED display sign and its previous display combination under different influencing parameters should be as small as possible.

[0059] In addition, in order to reflect the relative importance of each influencing parameter for the display combination adjustment of the LED display sign, combined with the consistent correlation, this embodiment calculates the time dimension acceptability of the current display combination on each LED display sign, and the expression is:

[0060] In the formula, is the time dimension acceptability of the current display combination on each LED display sign, FK0 is the current value of the Kth influencing parameter, FK1 is the value of the Kth influencing parameter when the previous display combination of the current display combination on each LED display sign was received, X[H] K is the correlation strength between the current display combination on each LED display sign and the Kth influencing parameter, M is the number of influencing parameters, ε1 is a preset value greater than 0, and to avoid the denominator being 0, ε1=0.01 in this embodiment, and the implementer can set it according to the actual situation. |FK0-FK1| is recorded as the second difference.

[0061] It should be understood that the larger the second difference is, the larger the difference between the Kth influencing parameter and the previous display combination of the LED display sign is, and the security of the current display combination of the LED display sign is poor. Therefore, the acceptability of the time dimension is low. In addition, taking the association strength as the weight, when the association strength of the influencing parameters is high, the fluctuation of these influencing parameters has a greater impact on the display combination regulation, and therefore special attention should be paid to the second difference of these influencing parameters; while for the influencing parameters with lower association strength, the fluctuation has a smaller impact, and has a smaller impact on the final security judgment of the current display combination of the LED display sign.

[0062] Step S005 , determining the influence coefficient between each LED display sign and its adjacent LED display sign based on the distance relationship between each LED display sign and its adjacent LED display sign, and the consistency degree of each historical display combination.

[0063] On highways, LED display signs are usually displayed according to the traffic conditions of different sections of the road. If two adjacent LED display signs are close to each other, the information they convey will have a stronger superposition effect on the driver. When multiple LED display signs are continuously in the driver's field of vision, the driver's visual attention can be enhanced. The closer the distance between LED display signs is, the easier it is for the driver to notice the information at the same time, thus generating a stronger influence. Therefore, the closer the distance between adjacent LED display signs is, the greater the influence they will produce.

[0064] In addition, if two adjacent LED display signs have more consistency in historical display content, such as displaying the same traffic conditions or instructions, then their impact on drivers will generally be greater. Similar historical display content can enhance the coherence and consistency of information, allowing drivers to better understand current road conditions and respond based on known information.

[0065] Based on the above analysis, this embodiment calculates the influence coefficient between each LED display sign and its adjacent LED display sign. The specific calculation method is:

[0066] Where Y H'-H is the influence coefficient between each LED display sign and its adjacent LED display sign, R H'-H is the metric distance between each LED display sign and its adjacent LED display sign. In this embodiment, the metric distance is calculated using the Euclidean distance. H'-H is the consistency coefficient of the tth display combination between each LED display sign and its adjacent LED display sign in the preset number of display combinations, W is the number of the preset number of display combinations, and exp() is an exponential function with a natural constant as the base. H'-H ) is recorded as the first exponential function.

[0067] It should be noted that when the display combination of each LED display sign and its adjacent LED display sign in the preset number of display combinations is exactly the same, the consistency coefficient is 1, otherwise, the consistency coefficient is 0. The larger the metric distance between two adjacent LED display signs, the weaker the impact on the driver. Therefore, the smaller the impact coefficient, the higher the consistency between the two adjacent LED display signs in the historical display combination, that is, The larger it is, the greater its impact on the driver will usually be, and therefore, the larger the impact coefficient is.

[0068] Step S006, through the influence coefficient between each LED display sign and its adjacent multiple LED display signs, as well as the consistency of the current display combination, combined with the acceptability of the time dimension, the display coefficient of the current display combination of each LED display sign is obtained, and the current display combination of each LED display sign is safety judged.

[0069] For any two non-adjacent LED display signs B and C, the influence degree between LED display sign B and LED display sign C is often affected by all LED display signs between LED display sign B and LED display sign C. Therefore, for non-adjacent LED display sign B and LED display sign C, based on the influence coefficient between adjacent LED display signs, the fusion influence coefficient between non-adjacent LED display sign B and LED display sign C is calculated, specifically:

[0070] The cumulative multiplication result of the influence coefficients of all any two adjacent LED display signs between LED display sign B and LED display sign C is calculated as the fusion influence coefficient between the non-adjacent LED display sign B and LED display sign C. For example, the arrangement order of the LED display signs between LED display sign B and LED display sign C is: LED display sign B, LED display sign D, LED display sign G, LED display sign C, then the fusion influence coefficient is the cumulative multiplication result of the influence coefficient between LED display sign B and LED display sign D, the influence coefficient between LED display sign D and LED display sign G, and the influence coefficient between LED display sign G and LED display sign C.

[0071] Finally, based on the consistency between the fusion influence coefficient and the current display combination of the LED display signs, combined with the acceptability of the time dimension, the display coefficient of the current display combination of each LED display sign is calculated, and the expression is:

[0072] In the formula, is the display coefficient of the current display combination of each LED display sign, is the time dimension acceptability of the current display combination on each LED display sign, C is the preset number of adjacent LED display signs of each LED display sign, is the fusion influence coefficient of each LED display sign and its adjacent vth LED display sign, is the consistency coefficient of the current display combination of each LED display mark and its adjacent vth LED display mark. In this embodiment, C=5, that is, the C LED display marks closest to each LED display mark, which can be set by the implementer according to the actual situation, and this embodiment does not limit it here. The display coefficient determination flow chart is as follows Figure 2 shown.

[0073] It should be understood that, when the time dimension acceptability of the current display combination on each LED display sign is greater, it means that the safety of the current display combination of each LED display sign is higher, that is, the more likely it is a display combination associated with the real-time traffic situation, and the more it should be displayed. Therefore, the larger the display coefficient is, and the larger the fusion influence coefficient between each LED display sign and its adjacent LED display signs is, and the larger the consistency coefficient is, it indicates that the display content of the current display combination of each LED display sign is more credible and less likely to be interfered with. Therefore, the larger the display coefficient of the current display combination of each LED display sign is, the more it should be displayed.

[0074] Finally, based on the display coefficient of the current display combination of each LED display sign, the safety of the current display combination of each LED display sign is determined, specifically: when the normalized value of the display coefficient of the current display combination of any LED display sign is greater than a preset threshold, the current display combination of any LED display sign is determined to be safe and displayed; otherwise, the current display combination of any LED display sign is determined to be unsafe and not displayed.

[0075] In this embodiment, the display coefficient is normalized using a Sigmoid function, and the implementer may select other existing feasible normalization methods. In this embodiment, the preset threshold is 0.7, and the implementer may set it according to the actual situation.

[0076] It should be noted that the above sequence of the embodiments of the present application is for description only and does not represent the advantages and disadvantages of the embodiments. The above is a description of a specific embodiment of this specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0077] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0078] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Modifications to the technical solutions recorded in the aforementioned embodiments, or equivalent replacement of some of the technical features therein, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A safety protection method for a variable information sign system on a highway, characterized in that: The method comprises the following steps: Real-time acquisition of the display status of each LED light on each LED display sign in the highway variable information sign system; real-time acquisition of various influencing parameters affecting the information content on each LED display sign; recording the display status of all LED lights on each LED display sign as a display combination; Analyze the correlation between each historical display state of each LED lamp on each LED display sign and each influencing parameter, and determine the consistent correlation between various display states of each LED lamp on each LED display sign and each influencing parameter; The consistent correlation between various display states of all LED lights on each LED display sign and various influencing parameters is integrated to determine the correlation strength between various display combinations on each LED display sign and various influencing parameters; Analyze the difference between the influencing parameters of the current display combination on each LED display sign and the previous display combination, and obtain the acceptability of the time dimension of the current display combination on each LED display sign in combination with the correlation strength; Determine the influence coefficient between each LED display sign and its adjacent LED display sign based on the distance relationship between each LED display sign and its adjacent LED display sign, and the consistency degree of each historical display combination; By using the influence coefficient between each LED display sign and its adjacent multiple LED display signs, as well as the consistency of the current display combination, combined with the acceptability of the time dimension, the display coefficient of the current display combination of each LED display sign is obtained, and a safety judgment is made on the current display combination of each LED display sign.

2. A safety protection method for a highway variable information sign system as claimed in claim 1, characterized in that: The display status includes: off, red, green, and yellow.

3. A safety protection method for a highway variable information sign system as claimed in claim 1, characterized in that: The influencing parameters include: temperature, humidity, rainfall, traffic volume, wind speed, and visibility.

4. A safety protection method for a highway variable information sign system as claimed in claim 1, characterized in that: The determination of the consistent correlation includes: Obtain a preset number of display combinations of each LED display sign before the current display combination, and the calculation method of the consistent correlation is: In the formula, is the consistent correlation between the jth display state of the i-th LED light on each LED display sign and the K-th influencing parameter, exp[] is an exponential function with a natural constant as the base, is the number of times the i-th LED light in the preset number of display combinations of each LED display sign appears in the j-th display state, FK t is the value of the Kth influencing parameter when the jth display state of the ith LED lamp on each LED display sign appears for the tth time in the preset number of display combinations, and μ is the average value of the Kth influencing parameter when the jth display state of the ith LED lamp on each LED display sign appears all times in the preset number of display combinations.

5. The safety protection method for a highway variable information sign system according to claim 1, characterized in that: The determination of the association strength includes: For any display combination on each LED display sign, the cumulative sum of the consistent correlations between the display states of all LED lights and any influencing parameter is calculated, and the normalized value of the cumulative sum is used as the correlation strength between the any display combination on each LED display sign and the any influencing parameter.

6. A safety protection method for a highway variable information sign system as claimed in claim 1, characterized in that: The calculation method of the acceptability of the time dimension is: In the formula, is the time dimension acceptability of the current display combination on each LED display sign, FK0 is the current value of the Kth influencing parameter, FK1 is the value of the Kth influencing parameter when the previous display combination of the current display combination on each LED display sign was received, X[H] K is the correlation strength between the current display combination on each LED display sign and the Kth influencing parameter, M is the number of influencing parameters, and ε1 is a preset value greater than 0.

7. A safety protection method for a highway variable information sign system as claimed in claim 4, characterized in that: The determination of the influence coefficient includes: Calculate the metric distance between each LED display sign and its adjacent LED display sign, use the opposite of the metric distance as the exponent of an exponential function with a natural constant as the base, record it as a first exponential function, calculate the consistency coefficient of each LED display sign and its adjacent LED display sign in the preset number of display combinations for each display combination, calculate the mean of the consistency coefficients of the preset number of display combinations, and the influence coefficient is the product of the calculation result of the first exponential function and the mean; wherein, when the display combination between each LED display sign and its adjacent LED display sign is exactly the same, the consistency coefficient is 1, otherwise, the consistency coefficient is 0.

8. A safety protection method for a variable information sign system on a highway as claimed in claim 7, characterized in that: The determination of the display coefficient includes: For two non-adjacent LED display signs B and C, the fusion influence coefficient between the LED display sign B and the LED display sign C is calculated by using the influence coefficients of all any two adjacent LED display signs between the LED display sign B and the LED display sign C; Based on the consistency between the fusion influence coefficient and the current display combination of the LED display signs, combined with the time dimension acceptability, the display coefficient of the current display combination of each LED display sign is calculated, and the expression is: In the formula, is the display coefficient of the current display combination of each LED display sign, is the time dimension acceptability of the current display combination on each LED display sign, C is the preset number of adjacent LED display signs of each LED display sign, is the fusion influence coefficient of each LED display sign and its adjacent v-th LED display sign, is the consistency coefficient of the current display combination of each LED display sign and its adjacent vth LED display sign.

9. A safety protection method for a highway variable information sign system as claimed in claim 8, characterized in that: The fusion influence coefficient is the cumulative multiplication result of the influence coefficients of all any two adjacent LED display signs between the LED display sign B and the LED display sign C.

10. The safety protection method for a highway variable information sign system according to claim 1, characterized in that: The safety determination of the current display combination of each LED display sign includes: When the normalized value of the display coefficient of the current display combination of any LED display sign is greater than a preset threshold, the current display combination of any LED display sign is determined to be safe and displayed; otherwise, the current display combination of any LED display sign is determined to be unsafe and not displayed.

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