A safety protection method for a variable information sign system on a highway

Abstract

This application relates to the technical field of variable information safety on highways, and specifically to a safety protection method for a variable information sign system on a highway. The method comprises: obtaining in real time the display status of each LED light on each LED display sign in the variable information sign system; and various influencing parameters that affect the information content on each LED display sign; determining the correlation strength between various display combinations on each LED display sign and each influencing parameter; obtaining the time dimension acceptability of the current display combination on each LED display sign; determining the influence coefficient between each LED display sign and its adjacent LED display signs; obtaining the display coefficient of the current display combination of each LED display sign, and performing a safety assessment on the current display combination of each LED display sign. This application improves the safety and accuracy of the display combination of each LED display sign.

Description

Technical Field

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

[0002] Highway variable message signs are electronic displays used to disseminate real-time traffic information. They come in a variety of types, including gantry-type variable message signs, F-type variable message signs, and LED variable message signs. LED variable message signs, which use light-emitting diodes as display elements, offer high brightness, wide viewing angles, and flexible display content. They are suitable for disseminating information in adverse weather conditions and are a crucial component of highway variable message sign systems.

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

[0004] Currently, after receiving a command, each LED display sign directly displays the decrypted content, without taking into account the sign's historical performance or changes in the surrounding environment. If certain commands are no longer available due to device failure, network delays, or changes in surrounding traffic conditions, the displayed content is not promptly corrected, resulting in inaccurate information transmission and reduced 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 highway variable information sign system to solve the existing problems.

[0006] The present invention provides a safety protection method for a variable information sign system on a highway using the following technical solutions:

[0007] One 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 a 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] Analyzing the correlation between each historical display state of each LED light on each LED display sign and each influencing parameter, and determining consistent correlation between various display states of each LED light on each LED display sign and each influencing parameter;

[0010] Integrate the consistent correlations between various display states of all LED lights on each LED display sign and various influencing parameters, and 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 and the previous display combination on each LED display sign, and combine the correlation strength to obtain the time dimension acceptability of the current display combination on each LED display sign;

[0012] Determine the influence coefficient between each LED display sign and its adjacent LED display signs based on the distance relationship between each LED display sign and its adjacent LED display signs and the consistency 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 time dimension acceptability, 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] Where, 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 for all times in the preset number of display combinations.

[0019] In one embodiment, determining 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] Where, 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 reciprocal of the metric distance as the exponent of an exponential function with a natural constant as the base, denoted as a first exponential function, calculate the consistency coefficient of each LED display sign and its adjacent LED display sign in each display combination in the preset number of display combinations, calculate the average of the consistency coefficients for the preset number of display combinations, and calculate the influence coefficient as the product of the calculation result of the first exponential function and the average; 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, determining 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] Where, 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 v-th LED display sign.

[0029] In one embodiment, the fusion influence coefficient is a cumulative multiplication result of the influence coefficients of 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 performing 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 a highway variable information sign system 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 correlation strength between a display combination and an influencing parameter, the greater the correlation strength, the more likely the display combination is caused by the influencing parameter; further, the The difference between the previous display combination and the various influencing parameters of its previous display combination is combined with the said correlation 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 level 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, thereby 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 level of the current display combination, combined with the said 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 safety 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 of the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. 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 any 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 determining the coefficients for display. DETAILED DESCRIPTION

[0037] To further illustrate the technical means and effectiveness of this application's implementation of the intended invention, the following, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed description of the safety protection method for a variable message sign system on a highway proposed in this application, including its specific implementation, structure, features, and effectiveness. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[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 following describes in detail a specific solution of a safety protection method for a variable information sign system on a highway provided by the present application 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: obtaining the display status of each LED light on each LED display sign in the highway variable information sign system in real time; obtaining the influencing parameters affecting the information content on each LED display sign in real time; and recording the display status of all LED lights 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 to 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 on each LED display sign on the highway is denoted as N. Each LED light on each LED display sign has four display states: off, red, green, and yellow. This embodiment monitors the display state of each LED light on each LED display sign on the highway in real time. Furthermore, the highway's central control system obtains, in real time, various influencing parameters that affect the information content on each LED display sign. In this embodiment, these influencing parameters include temperature, humidity, rainfall, traffic volume, wind speed, and visibility. The implementer can freely set the type and number of influencing parameters, and this embodiment does not impose any restrictions on this. The combination of the display states of all LED lights on each LED display sign each time it receives a command is denoted as the display combination.

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

[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 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 "off" as 0, "red" as 1, "green" as 2, and "yellow" as 3, 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 actual conditions, and this embodiment does not limit it here.

[0048] Because the display content of an LED sign is related to various influencing parameters, and an LED sign is composed of N LED lights, the display state of each LED light is also related to various influencing parameters. When analyzing the relationship between the display state of each LED light and the influencing parameters, if the value of influencing parameter X changes relatively smoothly when the LED light is in display state 1, then the correlation between display state 1 and influencing parameter X is generally higher, where influencing parameter X is any one of temperature, humidity, rainfall, traffic flow, wind speed, and visibility. This is because when influencing parameter X remains stable, the display state of the LED light also remains unchanged, indicating a stable correlation between them. This stable state reduces the impact of external interference and other factors, resulting in the change of the LED light's display state being primarily controlled by influencing parameter X, rather than other influencing parameters. This stable correlation strengthens the causal relationship between the two and further increases 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] Where, 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 light 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 light 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 the greater the first difference, the greater the variation in the value of the Kth influencing parameter, 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 an 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 the combination of the display states of all LED lights on the LED display sign.

[0054] Therefore, this embodiment integrates the consistent correlations between the various display states of all LED lights on each LED display sign and the influencing parameters, which helps to improve the accuracy of the overall correlation determination of the LED display sign. Since the display state changes 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 influencing parameters between the current display combination on each LED display sign and its previous display combination, and combining the correlation strength to obtain the time dimension acceptability of the current display combination on each LED display sign.

[0058] When analyzing the safety of commands 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 consecutive display combination changes is small, the highway's central control system can respond more smoothly to the changes, avoiding over-adjustments or mis-responses, thereby ensuring the consistency and accuracy of the displayed content. Therefore, the difference between the current display combination of the LED display sign and the previous display combination under different influencing parameters should be as small as possible.

[0059] In addition, 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] Where, 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 strength of association 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 value preset to be greater than 0. To avoid a denominator of 0, ε1 = 0.01 in this embodiment. Implementers can set this value based on actual conditions. Denote |FK0 - FK1| as the second difference.

[0061] It should be understood that the larger the second difference is, the larger the gap 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, with 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 needs to 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 less impact on the final safety 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 signs are typically displayed based on traffic conditions on different sections of the road. If two adjacent LED signs are close together, the information they convey will have a stronger cumulative effect on the driver. When multiple LED signs are continuously within the driver's field of view, the driver's visual attention can be enhanced. The closer the distance between LED signs, the more likely the driver will notice the information at the same time, thus having a stronger impact. Therefore, the closer the distance between adjacent LED signs, the greater the impact they will have.

[0064] In addition, if two adjacent LED display signs have higher consistency in historical display content, for example, they are both showing 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 the current road conditions and respond based on the 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 distance between each LED display sign and its adjacent LED display sign. In this embodiment, the distance is calculated using the Euclidean distance. H'-H is the consistency coefficient of the t-th 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 is exactly the same in the t-th display combination among the preset number of display combinations, 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 degree of 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 generally 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 safety judgment of the current display combination of each LED display sign is performed.

[0069] For any two non-adjacent LED display signs B and C, the degree of influence 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] Calculate the cumulative product of the influence coefficients of all two adjacent LED display signs between LED display sign B and LED display sign C as the fusion influence coefficient between the non-adjacent LED display signs B and LED display sign C. For example, if the 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 product 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 time dimension acceptability, the display coefficient of the current display combination of each LED display sign is calculated, and the expression is:

[0072] Where, 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, The consistency coefficient of the current display combination of each LED display mark and its adjacent v-th LED display mark. In this embodiment, C=5, that is, the C LED display marks closest to each LED display mark. The implementer can set it according to the actual situation. 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 indicates that the security 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, and the larger the fusion influence coefficient between each LED display sign and its adjacent LED display signs, the larger the consistency coefficient, indicating 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, 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. The implementer may select other available normalization methods. In this embodiment, the preset threshold is 0.7, which may be set by the implementer according to actual conditions.

[0076] It should be noted that the order in which the embodiments of the present application are presented is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. Furthermore, the foregoing descriptions of specific embodiments of this specification are provided. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential sequence shown to achieve the desired results. In certain 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 referred to each other. Each embodiment focuses on the differences from other embodiments.

[0078] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Modifications to the technical solutions described in the aforementioned embodiments, or equivalent replacements 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 scope of protection of the present application.

Claims

1. A safety protection method for a highway variable information sign system, 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 a 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; Analyzing the correlation between each historical display state of each LED light on each LED display sign and each influencing parameter, and determining consistent correlation between various display states of each LED light on each LED display sign and each influencing parameter; Integrate the consistent correlations between various display states of all LED lights on each LED display sign and various influencing parameters, and 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 and the previous display combination on each LED display sign, and combine the correlation strength to obtain the time dimension acceptability of the current display combination on each LED display sign; Determine the influence coefficient between each LED display sign and its adjacent LED display signs based on the distance relationship between each LED display sign and its adjacent LED display signs and the consistency 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 time dimension acceptability, 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 according to claim 1, characterized in that: The display status includes: off, red, green, and yellow.

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

4. The safety protection method for a highway variable information sign system according to 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: Where, 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 for 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: Determining 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. The safety protection method for a highway variable information sign system according to claim 1, characterized in that: The calculation method of the time dimension acceptability is: Where, 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. The safety protection method for a highway variable information sign system according to claim 4, characterized in that: Determination of the influence coefficient includes: Calculate the metric distance between each LED display sign and its adjacent LED display sign, use the reciprocal of the metric distance as the exponent of an exponential function with a natural constant as the base, denoted as a first exponential function, calculate the consistency coefficient of each LED display sign and its adjacent LED display sign in each display combination in the preset number of display combinations, calculate the average of the consistency coefficients for the preset number of display combinations, and calculate the influence coefficient as the product of the calculation result of the first exponential function and the average; 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. The safety protection method for a highway variable information sign system according to claim 7, characterized in that: Determining 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: Where, 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 v-th LED display sign.

9. A safety protection method for a highway variable information sign system according to 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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