JPH01144200A - Traffic flow investigation system for automobile on road for exclusive automobile use - Google Patents

Abstract

PURPOSE:To simply and correctly attain an OD (origin destination) investigation by collating number data with an exit and an entrance read by a simplified type number plate reader provided on respective entrances and exits of an automobile exclusive-use road and accumulating OD data. CONSTITUTION:Number data read by a simplified type number plate reader 4 arranged at one exit of exit and entrance parts (a)-(e) of an expressway D and the number data read at respective entrances to locate at the upstream from the exit where reading is executed are collated. When two number data are coincident, the entrance is forecasted to be the entrance of an automobile, when one entrance is forecasted, the entrance is determined, and when plural entrances are forecasted, the correct entrance is determined by the collation of each present travel time and each temporary travel time and OD data are accumulated. Thus, the OD investigation at the automobile exclusive-use road is executed without any labor and correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a system for investigating vehicle traffic flow on expressways and other expressways, and particularly relates to an 0D (ORIGIN)
:Starting point DEST INAT I ON: Destination point) Regarding the investigation system.

(Prior art and its problems) Conventional OD surveys of traffic flow on expressways, etc.
For example, this is done by collecting passes that are handed out at the entrance and collected at the exit, but this is very time-consuming and requires manpower, and there is a problem that accurate investigation cannot be carried out if the pass is lost. Ta.

Furthermore, on expressways in metropolitan areas, tolls are often fixed and payments are made only at the entrance or exit.
In this case, it was not possible to carry out the investigation by collecting the above-mentioned pass tickets, and in order to carry out the investigation, it was necessary to station separate personnel at the entrances and exits to distribute and collect the survey cards. Also in such cases, there is a problem that accurate investigation cannot be conducted if the investigation field is lost.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a system for investigating the traffic flow of automobiles on a motorway that can easily and accurately perform a zero-dill inspection.

(Structure and Effects of the Invention) In order to achieve the above object, the present invention provides a vehicle traffic flow survey system on a motorway, and a simple license plate reading device installed at each entrance and exit of the motorway. and comparing the number data read by the simple number plate reader disposed at one of the exits with the number data read at each entrance located upstream of the exit where the reading was made. , an entrance prediction means for predicting an entrance whose number data match as the entrance of the automobile; and when one entrance is predicted by the entrance prediction means, that entrance is selected, and when a plurality of entrances are predicted, the entrance is selected. compares the current travel time between each entrance and the exit where the reading was performed with the provisional travel time based on the reading time for the same section, and determines that the difference between the two travel times is within a set range. The present invention is configured to include an entrance determining means for determining an entrance as the correct entrance, and a data storage means for accumulating traffic flow data in response to the determining operation of the entrance determining means.

According to this configuration, the number data read by the simple number plate reader placed at one of the exits is compared with the number data read at each entrance located upstream from the exit where the reading was made. When the number data match, that entrance is predicted to be the entrance of the car, and if one entrance is predicted, that entrance is predicted, and if multiple entrances are predicted, the current travel time is determined. The correct entrance is determined by checking with each provisional travel time, and OD data is accumulated.

Therefore, according to the present invention, the O
DI inspection will be possible.

Furthermore, according to the present invention, a simple license plate reader is used for vehicle recognition without using an expensive license plate reader with high reading accuracy,
Since the accuracy is compensated for by taking travel time into consideration, a practical OD investigation system for automobile roads with excellent performance and low cost can be obtained.

(Explanation of Examples) Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 is an overall configuration diagram of the traffic flow survey system.

In the figure, the code indicates an expressway, aSb.

C and dSe each indicate each entrance/exit portion of the expressway. As shown in FIG.
A simple license plate reading device (vehicle recognition device) 4 consisting of an OD camera 1, its image processing unit 2, and a night illuminator 3 is provided. The COD camera 1 images the license plate of a passing vehicle C, processes the image signal, reads the four-digit number on the license plate, and outputs the number data signal.

Reference numeral 5 denotes a solid device, which is comprised of an entrance prediction means 6, an entrance determination means 7, and a data storage means 8. Next, the basic operations performed by each of the above means will be explained.

The entrance prediction means 6 receives the vehicle number data signal read by the reading device 4 disposed at one of the exits, and
Before that, the car's number data signal read by each of the reading devices 4 at the entrances located upstream from the exit where the number data signal was obtained is compared, and when both number data signals match, The entrance is expected to be the entrance of the above-mentioned car.

Based on this prediction, in addition to the entrance through which the vehicle actually entered, the entrance through which the nominal vehicle having the same four-digit number as the vehicle entered is also predicted to be the entrance for that vehicle, and an entrance prediction signal is output. Further, when the entrance prediction means 6 is given a number data signal from each of the reading devices 4, it detects the given time and also outputs the time detection signal.

The entrance determining means 7 responds to the entrance prediction signal from the entrance prediction means 6, and reads the entrance when one population is expected, and reads each entrance when multiple entrances are expected. The system compares each current travel time data between the exits where the above was performed with each provisional travel time data for the same section, determines the entrance where the difference between both travel times is within a set range as the correct entrance, and issues an entrance determination signal. Output.

The calculation of the provisional travel time data above is based on the fact that the actual time (based on the time detection signal) at which the number data signal was obtained at the exit where the car exited is different from the time at which the number data signal was obtained at each expected entrance. This is done by subtracting from each time (based on the time detection signal) detected. The current travel time data is formed by sequentially updating and storing one piece of travel time data corresponding to the correct entrance in the provisional travel time.

In response to the entrance determination signal from the entrance determination means 7, the data storage means 8 stores the OD1! of the corresponding section! The addition operation is performed using a small amount of data.

Hereinafter, the operation in the above embodiment will be explained based on the flowchart of FIG. 3.

[Operation of Entrance Prediction Means] First, when a number data signal is given from the reading device 4 provided at the exit e of the entrance e in FIG. 1 (step l), the number data and the previous exit e are given. Each population located further upstream a, b, c,
The read number data ([a]'[b[C][dl] in FIG. 4) at step d is compared. And, for example, exit e
The 4-digit number data read in r53-4
2J, and only matches the ■ data at entrance a (detection time 11:09), the entrance is predicted to be a, and for example, the 4-digit number data at exit e is "12-34".
”, and the data at entrance a (detection time 11:01
0 minutes), data at the entrance (detection time 11:00
minute) and ■data at entrance d (detection time 10:50), the entrance is predicted to be a, bSd (step 2).

[Operation of Entrance Determining Means] Next, in the above prediction contents, it is determined whether there is one or more predicted entrances (step 3). If there is one, that is, if the number data is "54-32J" in the above, , calculate the tentative travel time by subtracting the time 11:09 when the population a entered the country from the outflow time at exit e. Step 4): The calculated tentative travel time data and the current travel time data shown in FIG. (Step 5).For example, if the exit time at exit e is 11:50, the provisional travel time is 41 minutes, which is almost the same as the current travel time of data ■, 40 minutes. Since they match (within the set range), entrance a is determined to be the correct entrance (step 6).On the other hand, the current travel time is 40
If the difference between the minutes and the multiplication is outside the set range, it is determined that the entrance a is not the correct entrance and the process returns to step 1.

In step 3, the number data is “12-3” as shown above.
4J and three inlets, then step 4.5 above.
In the same manner as in Step 7), provisional travel time data between each population a, b, and d and exit 0 is calculated, and each of the provisional travel time data is compared with each of the corresponding current travel time data. In the provisional travel time data above, the provisional travel times corresponding to entrances a, b, and d are 4.
0 minutes, 50 minutes, and 60 minutes, and the corresponding current travel times in the current travel time data are 40 minutes, 30 minutes, and 10 minutes.
Therefore, since the travel times at entrance a match as 40 minutes, entrance a is determined to be the correct entrance (step 8). Next, it is determined whether there is an entrance based on the determined content (step 9), and if there is no entrance, the process returns to step 1.

[Operation of data storage means] If it is determined in step 6 and step 9 that there is a correct entrance, "1" is added to the number of vehicles passing between entrance a and exit 0 and data is stored (step 10). As shown in FIG. 6, when the number of vehicles passing between entrances a and e in the 0Dii inspection data is rlooJ, it is determined to be rlON. Next, update the current travel time to the temporary travel time (Step 11)
Return to step l. In step 11, if the process moves from step 3 to step 7 in the above operation, the current travel time of 40 minutes between entrances a and e will not change because the temporary travel time and the current travel time match, but from step 3 to step 4, the current travel time of 40 minutes is updated to the provisional travel time of 41 minutes.

[Brief explanation of the drawing]

1 to 6 relate to an embodiment of the present invention, FIG. 1 is a block diagram showing the overall structure, FIG. 2 is a block diagram of main parts, FIG. 3 is a flowchart showing the operation, and FIG. [a], [bl
, [cl, [dl] are reading number data at each entrance; in FIG. 5, current travel 6 is entrance prediction means; 7 is population determination means; 8 is data storage means.

Claims (1)

[Claims] (1) A simple license plate reader installed at each entrance and exit of an expressway, the number data read by the simple license plate reader installed at one of the exits, and information on how the reading is done. entrance prediction means that compares number data read at each entrance located upstream of the exit, and predicts the entrance whose number data matches as the entrance of the automobile; If multiple entrances are expected, then the current travel time between each entrance and the exit where the reading was performed, and the reading time in the same section as above. an entrance determining means for comparing the provisional travel times with each other and determining an entrance for which the difference between both travel times is within a set range as the correct entrance; and accumulating traffic flow data in response to the determining operation of the entrance determining means. 1. A vehicle traffic flow survey system on an expressway, comprising data storage means.