Method, medium and system for estimating traffic volume of highway section

Abstract

The application discloses an expressway section traffic volume estimation method, medium and system, which comprises the following steps: obtaining the traffic volume of each entrance and each exit in a to-be-measured section of an expressway; calculating the traffic volume of the entrance outside the to-be-measured section according to the traffic volume of each entrance and each exit in the to-be-measured section; and calculating the traffic volume of each section of the to-be-measured section according to the traffic volume of each entrance and each exit in the to-be-measured section and the traffic volume of the entrance outside the to-be-measured section. The application reasonably utilizes the data of the entrances and exits of the expressway, the utilized data is easy to collect, the section traffic volume of the corresponding section can be accurately estimated, and the on-site detection is avoided, so that the consumption of manpower and material resources is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of highway cross-sectional traffic volume technology, and in particular to a method, medium and system for estimating highway cross-sectional traffic volume. Background Technology

[0002] With socio-economic development and urban expansion, road mileage and car ownership have increased rapidly, making traffic congestion one of the major problems restricting urban and economic development. Traffic volume forecasting can serve as an important basis for traffic decision-making, effectively control traffic, and improve the efficiency of road traffic operations.

[0003] Currently, there are various methods for predicting traffic volume at road cross-sections, such as time series decomposition, exponential smoothing, and grey prediction, which fully utilize medium-, long-term, and recent measured traffic volume data. However, these methods are complex and not very practical. Therefore, to estimate the traffic volume at a specific road section, it is generally necessary to send people to the site to investigate the traffic flow or use instruments to detect it. However, the duration of manual field investigations is insufficient, often only a few days, and cannot be continuously observed throughout the year. The data is highly biased, and long-term fieldwork is extremely demanding on human endurance. Summary of the Invention

[0004] This invention provides a method, medium, and system for estimating cross-sectional traffic volume on highways, addressing the problem that existing technologies fail to fully utilize statistical information from highway entrance and exit toll stations, relying instead on on-site manual surveys that result in large errors in the survey results of cross-sectional traffic volume on highways.

[0005] Firstly, a method for estimating traffic volume at highway cross-sections is provided, including:

[0006] Obtain the traffic volume at each entrance and exit within the test section of the highway;

[0007] Based on the traffic volume of each entrance and each exit within the road segment to be tested, the traffic volume of the entrance outside the road segment to be tested is calculated.

[0008] The traffic volume of each section of the road segment under test is calculated based on the traffic volume of each entrance and each exit within the road segment under test, and the traffic volume of entrances outside the road segment under test.

[0009] In a second aspect, a computer-readable storage medium is provided, on which computer program instructions are stored; when executed by a processor, the computer program instructions implement the method for estimating traffic volume at a highway cross-section as described in the first aspect embodiment.

[0010] Thirdly, a system for estimating traffic volume at a highway cross-section is provided, comprising: a computer-readable storage medium as described in the embodiments of the second aspect.

[0011] Thus, this embodiment of the invention makes reasonable use of the data from highway entrances and exits. The data used is easy to collect, which can not only accurately estimate the cross-sectional traffic volume of the corresponding road segment, but also avoid on-site detection, greatly reducing the consumption of manpower and material resources. The prediction method is relatively simple, with clear logic and steps, and is easy to code, which greatly reduces the learning difficulty and is conducive to promotion and application. It is also convenient to develop a module for calculating cross-sectional traffic volume in the existing highway big data platform system, laying the foundation for future highway management and decision-making. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a flowchart of a method for estimating traffic volume at a highway cross-section according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of a highway cross-section. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] This invention discloses a method for estimating traffic volume at a highway cross-section. It should be understood that highways include both upstream and downstream travel directions; therefore, traffic flow is also divided into upstream and downstream directions. Thus, the traffic volume at a certain cross-section in this invention is the sum of the upstream and downstream traffic volumes. The cross-section in this invention refers to the cross-section containing the entrance and exit at the same location of the road segment to be measured. For example... Figure 1 As shown, the method of this embodiment of the invention includes the following steps:

[0017] Step S101: Obtain the traffic volume of each entrance and each exit within the test section of the highway.

[0018] like Figure 2As shown, suppose the road segment to be tested has n entrances A, B, ..., I, ..., N and n exits A′, B′, ..., I′, ..., N′. The entrances and exits outside the road segment to be tested are represented by X and X′, respectively.

[0019] Let z represent the traffic volume at an entrance within the road segment to be tested, and j represent the entrance and exit numbers at a cross-section within the road segment to be tested (it should be understood that the entrance and exit numbers at the same cross-section are the same). j Let z' represent the traffic volume at the j-th entrance within the road segment to be tested. Let z' represent the traffic volume at an exit within the road segment to be tested. j Let ' represent the traffic volume at the j-th exit within the road segment to be measured. Where j = 1, 2, 3, ..., i, ..., n, i ≠ n.

[0020] Traffic volume at each entrance and exit within the test section can generally be obtained by statistically analyzing vehicle information recorded at each entrance and exit.

[0021] Step S102: Calculate the traffic volume at entrances outside the test road segment based on the traffic volume at each entrance and exit within the test road segment.

[0022] It should be understood that "entrances outside the test road segment" refers to all entrances outside the test road segment, and "exits outside the test road segment" refers to all exits outside the test road segment. Since the entrances and exits outside the test road segment are not within the scope of entrances and exits within the test road segment investigated in this embodiment of the invention, vehicles entering the highway from entrances outside the test road segment are of unknown origin, and vehicles exiting the highway from exits outside the test road segment are of unknown destination. Therefore, the traffic volume at the entrances outside the test road segment is unknown and needs to be calculated using the known traffic volume of each entrance and each exit within the test road segment. Specifically, this step includes the following process:

[0023] 1. Based on the traffic volume of each entrance and each exit within the road segment to be tested, calculate the traffic volume of the entrance outside the road segment to be tested, based on each exit within the road segment to be tested.

[0024] Vehicles entering the highway from an entrance within the tested section are not allowed to exit the highway from an exit located on the same cross-section as that entrance. Figure 2 For example, a vehicle entering from entrance A cannot exit from entrance A′. Its possible exit directions on the highway are only B′, C′, ..., I′, ..., N′, and X′, a total of n directions. Similarly, a vehicle entering from entrance B cannot exit from entrance B′. Its possible exit directions on the highway are only A′, C′, ..., I′, ..., N′, and X′, a total of n directions. The same logic applies to other entrances. Therefore, the probability of a vehicle traveling from entrance A to exit I′ is... The traffic flow exiting the highway at exit I′ is: Similarly, the traffic flow rates for vehicles traveling from other entrances to exit I′ on the highway are respectively The traffic flow from entrance X outside the test section is x. Vehicles can exit the highway from any exit within the test section or directly through the test section and exit from exit X′ outside the test section, with a total of n+1 directions. The probability of exiting the highway from exit I′ is... The traffic flow entering exit I′ and exiting the highway is Based on the above analysis, an equation is established between the traffic volume at each exit and the traffic volume at each entrance within the road segment to be tested, as follows:

[0025]

[0026]

[0027] ...

[0028]

[0029] The general formula can then be summarized as follows: Where, x j Let m represent the traffic volume at the entrance outside the test road segment based on the j-th exit within the test road segment, and m represent the entrance and exit numbers at a cross-section within the test road segment. Then m = 1, 2, 3, ..., i, ..., n, i ≠ n.

[0030] By transforming the above general formula, we obtain the following formula for calculating the traffic volume at the entrance outside the road segment under test, based on each exit within the road segment under test:

[0031]

[0032] 2. Calculate the average traffic volume of the entrance outside the test road segment based on each exit within the test road segment, and obtain the traffic volume of the entrance outside the test road segment.

[0033] Specifically, the formula for calculating the traffic volume at the entrance outside the road segment to be measured is as follows:

[0034]

[0035] in, This indicates the traffic volume at the entrance outside the road segment to be measured.

[0036] In this way, the traffic volume at the entrance outside the road segment to be tested can be obtained through this step.

[0037] Step S103: Calculate the traffic volume of each section of the road segment under test based on the traffic volume of each entrance and each exit within the road segment under test, and the traffic volume of entrances outside the road segment under test.

[0038] Specifically, this step includes the following process:

[0039] 1. Based on the traffic volume of each entrance and exit within the test road segment, and the traffic volume of entrances outside the test road segment, calculate the following: the first total traffic volume of vehicles entering the highway from an entrance before a selected entrance within the test road segment passing through the section where the selected entrance is located; the second total traffic volume of vehicles entering the highway from an entrance outside the test road segment passing through the section where the selected entrance is located; the third total traffic volume of vehicles entering the highway from a selected entrance within the test road segment passing through the section where the selected entrance is located; and the fourth total traffic volume of vehicles entering the highway from an entrance after a selected entrance within the test road segment passing through the section where the selected entrance is located.

[0040] Taking section II′, where entrance I and exit I′ are located, as an example, the explanation is as follows: Entrance I is the i-th entrance within the road segment to be tested. Specifically:

[0041] (1) Vehicles entering the highway from the entrance before selected entrance I within the road segment to be tested.

[0042] Vehicles entering the highway from entrance A and passing through section II′ must exit at any exit between exit I′ and exit N′ within the tested road segment, or at exit X′ outside the tested road segment. Therefore, the traffic flow of vehicles entering the highway from entrance A and passing through section II′ is:

[0043] Vehicles entering the highway from entrance B and passing through section II′ must exit at any exit between exit I′ and exit N′ within the tested road segment, or at exit X′ outside the tested road segment. Therefore, the traffic flow of vehicles entering the highway from entrance B and passing through section II′ is:

[0044] Similarly, the traffic flow of vehicles entering the highway from other entrances before entrance I passing through section II′ can be obtained. Thus, the formula for calculating the first total traffic volume Z1 of vehicles entering the highway from entrances before the selected entrance I within the test section passing through section II′ is as follows:

[0045]

[0046] (2) Vehicles entering the highway from entrance X outside the section to be tested

[0047] Vehicles entering the highway from entrance X outside the test section and exiting the highway after passing through section II′ must exit at any exit between exit I′ and exit N′ of the test section or exit X′ outside the test section. Therefore, the formula for calculating the second total traffic volume Z2 of vehicles entering the highway from entrance X outside the test section and passing through section II′ is as follows:

[0048]

[0049] (3) Vehicles entering the expressway from selected entrance I within the road segment to be tested.

[0050] Vehicles entering the highway from entrance I within the test section will inevitably pass through section II', regardless of which exit they exit from. Therefore, the total third traffic volume Z3 of vehicles entering the highway from selected entrance I within the test section passing through section II' is equal to the traffic volume of selected entrance I, i.e., Z3 = z i .

[0051] (4) Vehicles entering the expressway from the entrance after the selected entrance I within the road segment under test.

[0052] Vehicles entering the highway from a selected entrance I within the test section and exiting the highway after passing through section II′ must exit at any exit between exit A′ and exit I′ within the test section.

[0053] For example, the traffic flow of vehicles entering the highway from entrance I+1 within the tested road segment passing through section II′ is:

[0054] For example, the traffic flow of vehicles entering the highway from entrance I+2 within the tested road segment passing through section II′ is:

[0055] Similarly, the formula for calculating the total traffic volume Z4 of vehicles entering the highway from the selected entrance I within the test section at section II′ is as follows:

[0056]

[0057] 2. Calculate the sum of the first total traffic volume, the second total traffic volume, the third total traffic volume, and the fourth total traffic volume to obtain the traffic volume at the selected entrance section.

[0058] The traffic volume at section II′ of the road segment to be tested is the sum of the four types of traffic volumes mentioned above. Therefore, the formula for calculating the traffic volume at section II′ of the road segment to be tested is as follows:

[0059] Z I-I′ =Z1+Z2+Z3+Z4.

[0060] Furthermore, embodiments of the present invention also provide a computer-readable storage medium storing computer program instructions; when the computer program instructions are executed by a processor, they implement the method for estimating traffic volume at a highway cross-section as described in the above embodiments.

[0061] Furthermore, embodiments of the present invention also provide a system for estimating traffic volume at a highway cross-section, comprising: a computer-readable storage medium as described in the above embodiments.

[0062] In summary, the embodiments of the present invention make reasonable use of data from highway entrances and exits. The data used is easy to collect, which can not only accurately estimate the cross-sectional traffic volume of the corresponding road segment, but also avoid on-site detection, greatly reducing the consumption of manpower and material resources. The prediction method is relatively simple, with clear logic and steps, and is easy to code, which greatly reduces the learning difficulty and is conducive to promotion and application. It is also convenient to develop a module for calculating cross-sectional traffic volume in the existing highway big data platform system, laying the foundation for future highway management and decision-making.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for estimating traffic volume at a highway cross-section, characterized in that, include: Obtain the traffic volume at each entrance and exit within the test section of the highway; Based on the traffic volume of each entrance and each exit within the road segment to be tested, the traffic volume of the entrance outside the road segment to be tested is calculated. Based on the traffic volume of each entrance and each exit within the road segment to be tested, and the traffic volume of entrances outside the road segment to be tested, calculate the traffic volume of each section of the road segment to be tested. The step of calculating the traffic volume of each cross-section of the road segment to be measured includes: Based on the traffic volume of each entrance and each exit within the road segment under test, and the traffic volume of entrances outside the road segment under test, the following are calculated: the first total traffic volume of vehicles entering the highway from an entrance before a selected entrance within the road segment under test passing through the section where the selected entrance is located; the second total traffic volume of vehicles entering the highway from an entrance outside the road segment under test passing through the section where the selected entrance is located; the third total traffic volume of vehicles entering the highway from a selected entrance within the road segment under test passing through the section where the selected entrance is located; and the fourth total traffic volume of vehicles entering the highway from an entrance after a selected entrance within the road segment under test passing through the section where the selected entrance is located. The traffic volume at the selected entrance is obtained by summing the first total traffic volume, the second total traffic volume, the third total traffic volume, and the fourth total traffic volume. Vehicles entering the highway from the entrance prior to the selected entrance I within the road segment under test pass through section I- First total traffic volume Z The formula for calculating 1 includes: ； Vehicles entering the highway from an entrance outside the section under test pass through section I- Second total traffic volume Z The formula for calculating 2 includes: ； Vehicles entering the highway from selected entrance I within the tested road segment pass through section I- The third total traffic volume Z 3 represents the traffic volume at selected entrance I, where selected entrance I is the first entrance within the road segment to be measured. i One entry point; Vehicles entering the highway from the selected entrance I within the tested road segment pass through section I- The fourth total traffic volume Z The formula for calculating 4 includes: ； Wherein, the selected entrance I is the first entrance within the road segment to be tested. i One entry point, This indicates the traffic volume at the entrance outside the road segment being measured. z This represents the traffic volume at one entrance within the road segment being measured. j This indicates the entrance and exit numbers at a cross-section within the road segment to be tested. j =1, 2, 3, ... i , ... n .

2. The method for estimating traffic volume at a highway cross-section according to claim 1, characterized in that, The step of calculating the traffic volume at the entrance outside the road segment to be measured includes: Based on the traffic volume of each entrance and each exit within the road segment to be tested, the traffic volume of the entrance outside the road segment to be tested, based on each exit within the road segment to be tested, is calculated. Calculate the average traffic volume of the entrance outside the test road segment based on each exit within the test road segment, and obtain the traffic volume of the entrance outside the test road segment.

3. The method for estimating traffic volume at a highway cross-section according to claim 2, characterized in that, The formula for calculating the traffic volume at entrances outside the road segment under test, based on each exit within the road segment under test, includes: ； in, Indicates the first [unit] based on the road segment to be tested. j Traffic volume at entrances outside the test section of each exit. This represents the traffic volume at one exit within the road segment being measured. m This indicates the entrance and exit numbers at a cross-section within the road segment to be tested. m =1, 2, 3, ... i , ... n .

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, they implement the method for estimating the traffic volume of a highway section as described in any one of claims 1 to 3.

5. A traffic volume estimation system for highway cross-sections, characterized in that, include: The computer-readable storage medium as described in claim 4.

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