JP2001014586A - Device and method for estimating average vehicle speed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an average vehicle speed estimating device which estimates the average vehicle speed at a point on a road where a traffic flow measuring instrument is independently installed by using measured data at a point where both a traffic flow measuring instrument and a speed measuring instrument are installed. SOLUTION: This device is provided with an average vehicle length calculating means 9 calculating an average vehicle length at peripheral points from measured values of vehicle speed measuring instruments 3a to 3c and traffic flow measuring instruments 4a to 4c provided side by side at the peripheral points 5a to 5c, an average vehicle length estimating means 10 calculating an average vehicle length at an optional point on the basis of the calculated average vehicle length at the peripheral points and the distances from the optional point 5d to the peripheral points, and an average vehicle speed calculating means 11 calculating the average vehicle speed at the optional point by using the average vehicle length at the optional point calculated by the average vehicle length estimating means and the measured value of a traffic flow measuring instrument 4d installed at the optional point. It is possible to easily estimate a vehicle speed at a point where a traffic flow measuring instrument is independently installed by effectively utilizing vehicle speedometers and traffic flow measuring instruments being the existing devices of the current road traffic system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle average speed estimating device for determining an average speed of a vehicle traveling on a road and a method for estimating the average speed, and more particularly to a vehicle at a point where a traffic flow measuring device is independently installed. This makes it possible to estimate the average speed from the measured values at the points where the surrounding vehicle speed measuring device and traffic flow measuring device are installed.

[0002]

2. Description of the Related Art Conventionally, an average speed of a vehicle at a point where a traffic flow measuring device is independently installed is measured by measuring traffic flow data (traffic volume: number of vehicles per unit time, occupancy time: vehicle occupying a road surface). A method of deriving the average vehicle length from the average vehicle length is known. The average vehicle length is generally derived as a fixed value based on statistical vehicle type information based on traffic surveys such as traffic demand.

In the method described in Japanese Patent Application Laid-Open No. 6-16287, when a vehicle speed measuring device is present on an observation section road where a traffic flow measuring device is installed, the vehicle speed measuring device is used. The average vehicle length of the section is updated for each measurement unit time, using the speed data measured in the above section and the traffic flow data measured by the nearest traffic flow measuring instrument.

As a mechanical average vehicle length measurement, AVI
(Automatic Vehic1e Identification system: vehicle recognition device) or install a photodetector that can recognize the ID of an individual vehicle, obtain the vehicle type from the identified individual information, and calculate the average vehicle length from the vehicle length by general vehicle type. There is a way.

[0005]

However, when calculating the average vehicle speed from the measured traffic flow data, the conventional calculation method that uses a fixed value as the average vehicle length of the vehicle does not include the actual vehicle speed on the road in the measurement section. When the vehicle type composition ratio is different from the planned ratio, there is a problem that an error occurs in the calculated average speed.

In the above-described method of updating the average vehicle length for each measurement unit time using data of a speed measuring device installed on a road in an observation section, at least one speed measuring device is installed in the section. There is a need to. Also, in this method, the average vehicle length of the section including one speed measuring device is assumed to be the same throughout the section, but such assumption does not hold when the road in the section is branched. There are cases.

Further, the method of obtaining the average vehicle length from the vehicle type information identified by the AVI has a relatively high cost of the AVI and is mostly installed on main roads. Is limited.

[0008] Further, the method of obtaining the average vehicle length using the light sensor is limited in its use range to a point or a section where the traffic flow measuring device and the light sensor are provided together. Although the installation of photodetectors is currently underway, the majority of locations are equipped with traffic flow measuring devices alone, and it is anticipated that single traffic flow measuring device installation sites will remain in the future. You.

SUMMARY OF THE INVENTION The present invention solves such a conventional problem. The present invention relates to a method for measuring the average vehicle speed at a point on a road where a traffic flow measuring device is independently installed. It is an object of the present invention to provide a vehicle average speed estimating device for estimating using a measured data of a point which has been set, and to provide a vehicle average speed estimating method.

[0010]

Therefore, according to the present invention, it is possible to measure only the presence or absence of a vehicle by using the measured values of peripheral points where the vehicle speed and the presence or absence of the vehicle can be measured. In order to construct a device for estimating the vehicle speed at an arbitrary point, the peripheral point is determined from the measured values of the vehicle speed measuring means for measuring the vehicle speed and the traffic flow measuring means for measuring the traffic flow data, which are attached to the peripheral point. Average vehicle length calculating means for calculating the average vehicle length in the, the average vehicle length at the arbitrary point based on the average vehicle length of the peripheral point and the distance from the arbitrary point to the peripheral point calculated by the average vehicle length calculating means The average vehicle length estimating means to be calculated, and the average vehicle length at the arbitrary point calculated by the average vehicle length estimating means and the vehicle average speed at the arbitrary point using the measurement value of the traffic flow measuring means installed at the arbitrary point. Car to calculate It is provided and the average speed calculating unit.

In the method for estimating the vehicle speed, a plurality of peripheral points, which are located on an upstream or downstream road of an arbitrary point on the road and provided with a vehicle speed measuring means and a traffic flow measuring means, are selected. The average vehicle length at the peripheral point is calculated from the measured values of the vehicle speed measuring means and the traffic flow measuring means at the peripheral point, and the arbitrary point is calculated based on the calculated average vehicle length of the peripheral point and the distance from the arbitrary point to the peripheral point. The average vehicle length at an arbitrary point is estimated, and the average vehicle length at the arbitrary point is calculated using the estimated average vehicle length at the arbitrary point and the measured value of the traffic flow measuring means installed at the arbitrary point. .

[0012] Therefore, using the data obtained from the existing devices (vehicle speedometer, vehicle discriminator, traffic flow measuring device) of the current road traffic system, the vehicle average at the point where the traffic flow measuring device is installed alone is used. Speed can be easily determined.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention uses the measured values of peripheral points where the vehicle speed and the presence or absence of a vehicle can be measured to determine whether or not the vehicle is present. Is a device for estimating the vehicle speed at an arbitrary point that can be measured only from the measured values of the vehicle speed measuring means for measuring the vehicle speed and the traffic flow measuring means for measuring the traffic flow data, which are attached to the surrounding points. Average vehicle length calculating means for calculating an average vehicle length at a peripheral point, and an average vehicle at an arbitrary point based on the average vehicle length of the peripheral point and the distance from the arbitrary point to the peripheral point calculated by the average vehicle length calculating means. Average vehicle length estimating means for calculating length, and vehicle average at an arbitrary point using the average vehicle length at an arbitrary point calculated by the average vehicle length estimating means and the measured value of the traffic flow measuring means installed at the arbitrary point Vehicle flat to calculate speed The speed calculation means is provided, and the existing equipment (vehicle speedometer and traffic flow measuring device) of the current road traffic system is effectively used to determine the vehicle speed at the point where the traffic flow measuring device is installed alone. Can be easily estimated.

According to a second aspect of the present invention, a speed measuring device is provided as vehicle speed measuring means, and existing equipment can be used.

According to a third aspect of the present invention, as the vehicle speed measuring means, two vehicle identifiers capable of identifying and timing individual vehicles are provided, and each of the vehicle identifiers measures the passing time of the same vehicle. The vehicle speed is measured from the transit time obtained from the difference between the transit times and the distance between the two vehicle identifiers, and the vehicle speed can be measured using existing equipment.

According to a fourth aspect of the present invention, there is provided a traffic information database for storing information on a road network including installation positions of vehicle speed measuring means and traffic flow measuring means, positions of intersections, road traveling directions and road lengths. The data of each point and the route and positional relationship between the points can be stored and used in this database.

According to a fifth aspect of the present invention, the vehicle speed measuring means is traced on an upstream or downstream road of an arbitrary point where only the traffic flow measuring means is installed, using each data stored in the traffic information database. And a route / distance search means for sequentially searching for a peripheral point provided with a traffic flow measuring means and deriving a route and a distance from an arbitrary point to the peripheral point. And the route and the distance therefrom are derived.

According to a sixth aspect of the present invention, the average vehicle length calculating means calculates the vehicle speed measured by the vehicle speed measuring means at each peripheral point as Vi, and the traffic volume of the traffic flow data measured by the traffic flow measuring means. Where Qi is the road occupation time and Oi is the road occupancy time, the average vehicle length Li at the peripheral points is calculated by Li = Vi · Oi / Qi, and the average vehicle length Li is calculated from the speed data and traffic flow data at each peripheral point. The length can be calculated.

According to a seventh aspect of the present invention, the average vehicle length estimating means replaces the average vehicle length Li of each peripheral point calculated by the average vehicle length calculating means with the average vehicle length Li of the peripheral point which is short from an arbitrary point. The average vehicle length L 'at an arbitrary point is calculated by performing weighted averaging so that the weight becomes greater as the length becomes longer, and it is possible to estimate the average vehicle length at an arbitrary point from the average vehicle length at a peripheral point. it can.

In the invention described in claim 8, the vehicle average speed calculating means sets the traffic volume of the traffic flow data measured by the traffic flow measuring device installed at an arbitrary point to Q ', and sets the vehicle occupancy time to O. , The average vehicle length L 'at an arbitrary point calculated by the average vehicle length estimating means is used to calculate the average vehicle speed V' at an arbitrary point by V '= L'.Q' / O '. The average vehicle speed at an arbitrary point where the traffic flow measuring device is independently installed can be obtained.

According to a ninth aspect of the present invention, an arbitrary point at which only the presence or absence of a vehicle can be measured using each measured value of a peripheral point at which the vehicle speed and the presence or absence of the vehicle can be measured. A method for estimating the vehicle speed of the vehicle, by tracing on an upstream or downstream road of an arbitrary point, selecting a plurality of peripheral points provided with a vehicle speed measuring means and a traffic flow measuring means,
The average vehicle length at the peripheral point is calculated from the measured values of the vehicle speed measuring means and the traffic flow measuring means at the peripheral point, and the average vehicle length at the peripheral point is calculated based on the calculated average vehicle length at the peripheral point and the distance from the arbitrary point to the peripheral point. The average vehicle length at a point is calculated, and the average vehicle length at the arbitrary point is calculated using the calculated average vehicle length at the arbitrary point and the measurement value of the traffic flow measuring means installed at the arbitrary point. It is easy to estimate the vehicle speed at a point where a traffic flow meter is installed independently using data obtained from existing devices (vehicle speedometer and traffic flow meter) in the current road traffic system. can do.

According to a tenth aspect of the present invention, as a vehicle speed measuring means, two vehicle identifiers capable of identifying and timing an individual vehicle are installed at a predetermined distance, and each of these vehicle identifiers is identical. A vehicle passing time is measured, and a vehicle speed is calculated from a passing time obtained from a difference between the passing times and a distance between the two vehicle identifiers, and an existing vehicle identifier is used. To determine the vehicle speed.

According to the present invention, there is provided traffic information in which each information of a road network including an installation position of a vehicle speed measuring means and a traffic flow measuring means, a position of an intersection, a traveling direction of a road and a road length is stored. Searches a database and selects a point adjacent to an arbitrary point on the upstream or downstream road and provided with a vehicle speed measuring means and a traffic flow measuring means as a peripheral point. Can search for a nearby point adjacent to an arbitrary point, and determine the route and length to that point.

According to a twelfth aspect of the present invention, the vehicle speed measured by the vehicle speed measuring means at the peripheral point is Vi, the traffic volume of the traffic flow data measured by the traffic flow measuring means is Qi, and the road occupation time of the vehicle. Is defined as Oi, the average vehicle length Li at the peripheral point is calculated by Li = Vi · Oi / Qi, and the average vehicle length Li at each peripheral point is obtained from the speed data and traffic flow data obtained from the existing device. The length can be calculated.

According to a thirteenth aspect of the present invention, the average vehicle length Li at each peripheral point is weighted and averaged so that the weight becomes greater as the average vehicle length at a peripheral point closer to the arbitrary point becomes greater. The average vehicle length at any point can be estimated from the average vehicle length at surrounding points.

According to a fourteenth aspect of the present invention, when the traffic volume of the traffic flow data measured by the traffic flow measuring means installed at an arbitrary point is Q 'and the road occupancy time of the vehicle is O', The vehicle average speed V 'at an arbitrary point is calculated by V' = L'Q '/ O' using the average vehicle length L 'at It is possible to estimate the average vehicle speed at any given point.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of the vehicle average speed estimating apparatus according to the embodiment. In FIG. 1, 1 is a schematic diagram of a road, and 2 is a schematic diagram of an intersection. At each of the points 5a, 5b, 5c on the road, a speed measuring device 3a, 3b, 3c for measuring the speed of the traveling vehicle, a traffic flow measuring device 4a for measuring traffic flow data (traffic volume, occupation time), 4b and 4c are provided side by side. On the other hand, only the traffic flow measuring device 4d is installed at the point 5d on the road.

This device for estimating the average vehicle speed at the point 5d on the road is provided by the installation position of the vehicle speed measuring device and the traffic flow measuring device, the position of the intersection, the traveling direction of the road, and the length of the road network. The traffic information database 7 storing information and measurement data of the traffic flow measuring instruments 4a to 4c installed at the surrounding measurement points 5a, 5b, and 5c, and the measurement points 5a, 5b, and 5c adjacent to the point 5d are searched. Point / route searching means 8 for deriving the route and distance from the point 5d to each measurement point, and the speed measuring device 3a installed at the measurement points 5a to 5c
Vehicle length calculating means 9 for calculating the average vehicle length at the measurement points 5a to 5c using the data stored in the traffic information database 7 and the average vehicle length estimation for estimating the average vehicle length at the point 5d. Mean vehicle speed calculation for calculating the average vehicle speed at the point 5d using the means 10 and the data of the traffic flow measuring device 4d installed at the point 5d and the data of the average vehicle length estimated by the average vehicle length estimating means 10 And a processing unit 6 including the means 11.

The processing section 6 is constituted by a microcomputer, and the processing of each means is performed according to a program stored in a memory existing in the processing section.

The operation of the device will be described. For simplicity, only one of the roads in FIG. 1 is considered. The upper part of the drawing is upstream and the lower part is downstream. The vehicle flows from the upstream, passes through the intersection 2 via the point 5a or 5b, and then flows downstream through 5d and 5c. In the meantime, speed data is obtained by the speed measuring devices 3a to 3c,
It is assumed that traffic flow data is measured by the traffic flow measuring devices 4a to 4d.

In the apparatus of this embodiment, the processing unit 6 acquires the average value of the measured values for 5 minutes at each time from the speed measuring devices 3a to 3c, and obtains the average value from the traffic flow measuring devices 4a to 4d. 5 minutes of traffic flow data (traffic volume, occupation time).

However, the speed measuring devices 3a to 3c and the traffic flow measuring devices 4a to 4d are provided with, for example, -1 to make it possible to identify speed data and traffic flow data when they cannot be obtained due to unmeasured data. Is output.

The processing section 6 uses the data acquired from the speed measuring devices 3a to 3c and the traffic flow measuring devices 4a to 4d, and uses a point / route searching means 8, an average vehicle length calculating means 9, an average vehicle length estimating means 10, And the vehicle average speed calculation means 11 are sequentially executed,
The average vehicle speed at an arbitrary point 5d where a single traffic flow measuring device 4d is installed is estimated.

Hereinafter, each means will be described.

FIG. 2 shows a processing flow of the point / route searching means 8.

Step 201: The point / route searching means 8
First, each data of the installation position of each vehicle speed measurement device and the traffic flow measurement device, the position of the intersection, the traveling direction of the road, and the road length is read from the traffic information database 7, and step 202: i = 1 is set; : Based on each data, it is connected to an arbitrary point (5d in FIG. 1) where a single traffic flow measuring instrument is installed, and a peripheral point where a speed measuring instrument and a traffic flow measuring instrument are installed (FIG. 1)
Then, 5a, 5b, 5c) are searched using, for example, a route search technique such as the Dijkstra method, and an unextracted and shortest distance peripheral point i (= 1) is extracted upstream or downstream of an arbitrary point.

Step 204: If i = n has not been reached, the value of i is incremented by one, and then step 203
And the process of step 203 is repeated. This is repeated n times, and the extracted points are sequentially called i (= 1, 2,..., N)
And

Step 205: From an arbitrary point to each point i (=
Calculate the distance Di of each route up to 1, 2,..., N)
save.

Next, the average vehicle length calculating means 9 calculates the average vehicle length Li at each point i searched by the point / route searching means 8. FIG. 3 shows a processing flow of the average vehicle length calculating means 9.

Step 301: The average vehicle length calculating means 9 obtains speed data Vi from the speed measuring device at each point i, and obtains traffic flow data (traffic volume Qi, Occupancy time Oi) traffic information database 7
Read from.

Step 302: Next, the average vehicle length Li at the point i is calculated from the speed Vi of the vehicle, the occupation time Oi passing through the traffic flow measuring device, and the traffic volume Qi according to the equation (1). Li = Vi · Oi / Qi (1)

Step 303: The calculated average vehicle length Li is stored.

Next, the average vehicle length estimating means 10 calculates the average vehicle length Li of each point i calculated by the average vehicle length calculating means 9 and
Using the distance Di calculated by the route search means 8, an average vehicle length L 'at an arbitrary point is estimated. FIG. 4 shows a processing flow of the average vehicle length estimation means 10.

Step 401: The average vehicle length estimation means 10 reads the average vehicle length Li of each point i (= 1, 2,..., N) and the distance Di from an arbitrary point. Then, the average vehicle length L ′ at an arbitrary point is calculated by Expression 2 using Equation (2). L ′ = Σ (Li / Di) / Σ (1 / Di) (2) (Σ is added from i = 1 to n) Here, the average vehicle length Li of each point i is calculated from an arbitrary point. The closer the distance is, the more weighted the weighted average is, and the average vehicle length L 'at an arbitrary point is obtained.

Step 403: The average vehicle length L 'thus estimated is stored.

Next, the vehicle average speed calculating means 11 calculates the estimated average vehicle length L 'calculated by the average vehicle length estimating means 10 and the traffic flow data (traffic volume Q) obtained from the traffic flow measuring device 4d at the arbitrary point 5d. ', The occupation time O') to calculate the average vehicle speed at an arbitrary point. FIG. 5 shows a processing flow of the vehicle average speed calculating means 11.

Step 501: Mean vehicle speed calculating means 11
Acquires traffic flow data (traffic volume Q ', occupancy time O') from the traffic flow measuring device 4d at an arbitrary point 5d, reads the estimated average vehicle length L 'estimated by the average vehicle length estimation means 10, Step 502: From the values of Q ', O', and L ', the vehicle average speed at an arbitrary point is calculated by Expression 3. V ′ = L ′ · Q ′ / O ′ (3)

Step 503: The average vehicle speed V 'at the arbitrary point thus obtained is stored.

The point / route searching means 8, average vehicle length calculating means 9, average vehicle length estimating means 10, and vehicle average speed calculating means
Step 11 repeats the above operation at each time point. Thereby, the vehicle average speed V 'of the arbitrary point 5d is estimated at each designated time point.

As described above, the vehicle average speed estimating apparatus calculates the vehicle average speed at a point where the traffic flow measuring device is independently installed, and calculates the vehicle average speed at a point around the vehicle speed measuring device and the traffic flow measuring device. It can be estimated using measured values.

This traffic flow measuring device can detect only the presence or absence of a vehicle. Therefore, with this vehicle average speed estimating device, it is possible to estimate the vehicle speed at a point at which only the presence or absence of the vehicle can be measured from each measurement value at a peripheral point at which the vehicle speed and the presence or absence can be measured. become.

The measurement of the vehicle speed at the peripheral point is performed by using two vehicle identifiers capable of identifying and measuring an individual vehicle instead of the speed measuring device, and passing between the vehicle identifiers of the same vehicle. The time may be measured, and the vehicle speed may be calculated from the obtained time and the distance between the two vehicle identifiers.

[0054]

As is clear from the above description, in the vehicle average speed estimating apparatus and the estimating method of the present invention, the vehicle speed at a point where only the presence or absence of the vehicle can be measured is determined by the vehicle speed and the presence or absence of the vehicle. Can be estimated from the measured values of the surrounding points where the measurement can be performed.

This vehicle average speed estimating device does not require regular surveys and updates as conventionally performed, and can reduce the cost and time as compared with the related art.

In this vehicle average speed estimating device, a vehicle speed measuring device, a vehicle discriminator and a traffic flow measuring device which have been conventionally installed are used to determine the location where the traffic flow measuring device is independently installed. Since the average vehicle speed can be calculated, existing facilities in the current road traffic system can be effectively used, and costs for new installation of facilities and the like can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle average speed estimation device according to an embodiment of the present invention;

FIG. 2 is a processing flowchart of a point / route searching means according to the embodiment of the present invention;

FIG. 3 is a processing flowchart of an average vehicle length calculating unit according to the embodiment of the present invention;

FIG. 4 is a processing flowchart of an average vehicle length estimating unit according to the embodiment of the present invention;

FIG. 5 is a processing flowchart of a vehicle average speed calculation unit according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road 2 Intersection 3a-3c Speed measuring device 4a-4d Traffic flow measuring device 5a-5c Speed measuring device, point where a traffic flow measuring device is attached 5d Traffic flow measuring device single installation point 6 Processing unit 7 Traffic information database 8 Point / route search Element means 9 Average vehicle length calculation means 10 Average vehicle length estimation means 11 Vehicle average speed calculation means

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Oda 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa F-term in Matsushita Communication Industrial Co., Ltd. (Reference) 5H180 AA01 DD02 EE02

Claims (14)

[Claims] An apparatus for estimating a vehicle speed at an arbitrary point where only the presence or absence of a vehicle can be measured using each measured value of a peripheral point capable of measuring the vehicle speed and the presence or absence of a vehicle. An average vehicle length that is attached to the peripheral point and calculates an average vehicle length at the peripheral point from measurement values of a vehicle speed measuring unit that measures vehicle speed and a traffic flow measuring unit that measures traffic flow data. Calculating means; calculating an average vehicle length at the arbitrary point based on the average vehicle length of the peripheral point calculated by the average vehicle length calculating means and the distance from the arbitrary point to the peripheral point. Means for calculating a vehicle average speed at the arbitrary point using the average vehicle length at the arbitrary point calculated by the average vehicle length estimating means and a measurement value of the traffic flow measuring means installed at the arbitrary point. vehicle A vehicle average speed estimating device comprising: an average speed calculating means. 2. The vehicle average speed estimating device according to claim 1, wherein a speed measuring device is provided as the vehicle speed measuring means. 3. The vehicle speed measuring means includes two vehicle discriminators capable of identifying and timing an individual vehicle, and each of the vehicle discriminators measures a passing time of the same vehicle, and The vehicle average speed estimating device according to claim 1, wherein the vehicle speed is measured from a passing time obtained from a difference between the vehicle speed and a distance between the two vehicle classifiers. 4. A traffic information database for storing information on a road network including installation positions of said vehicle speed measuring means and traffic flow measuring means, positions of intersections, road traveling directions and road lengths. The vehicle average speed estimation device according to claim 1. 5. Using each data stored in the traffic information database, the vehicle speed measuring means and the traffic flow measuring means follow the upstream or downstream road of an arbitrary point where only the traffic flow measuring means is installed. 5. The vehicle average speed estimating device according to claim 4, further comprising a point / route searching means for sequentially searching for adjacent peripheral points and deriving a route and a distance from the arbitrary point to the peripheral point. 6. An average vehicle length calculating unit calculates a vehicle speed measured by the vehicle speed measuring unit at each peripheral point as V
i, when the traffic volume of the traffic flow data measured by the traffic flow measuring means is Qi, and the road occupancy time is Oi, calculating the average vehicle length Li at the peripheral point by Li = Vi · Oi / Qi. The vehicle average vehicle length estimation device according to claim 1, wherein 7. The average vehicle length Li at each peripheral point calculated by the average vehicle length calculation unit, wherein the average vehicle length estimation unit calculates
7. The average vehicle length L ′ at the arbitrary point is calculated by performing weighted averaging so that the weight becomes greater as the average vehicle length of the peripheral points closer to the arbitrary point is greater. The vehicle average speed estimation device according to any one of the preceding claims. 8. The vehicle average speed calculating means calculates the traffic volume of the traffic flow data measured by the traffic flow measuring means installed at the arbitrary point as Q ′, and calculates the vehicle occupancy time as O ′.
Then, using the average vehicle length L 'at an arbitrary point calculated by the average vehicle length estimating means, the vehicle average speed V' at the arbitrary point is calculated by V '= L'Q' / O '. The vehicle average speed estimating device according to claim 7, wherein: 9. A method of estimating a vehicle speed at an arbitrary point where only the presence or absence of a vehicle can be measured using each measurement value of a peripheral point where the vehicle speed and the presence or absence of a vehicle can be measured. And tracing an upstream or downstream road of an arbitrary point to select a plurality of peripheral points provided with a vehicle speed measuring means and a traffic flow measuring means, wherein the vehicle speed measuring means and the traffic flow measuring means at the peripheral point are selected. Calculating the average vehicle length at the peripheral point from the measured value of the above, calculating the average vehicle length at the arbitrary point based on the calculated average vehicle length of the peripheral point and the distance from the arbitrary point to the peripheral point. Calculating an average vehicle speed at the arbitrary point by using the calculated average vehicle length at the arbitrary point and a value measured by the traffic flow measuring means installed at the arbitrary point. Method. 10. A vehicle speed measuring means in which two vehicle identifiers capable of identifying and timing an individual vehicle are installed at a predetermined distance, and each of the vehicle identifiers measures a passing time of the same vehicle. 10. The vehicle average speed estimation method according to claim 9, wherein a vehicle speed is calculated from a passage time obtained from the difference between the passage times and a distance between the two vehicle identifiers. 11. Searching a traffic information database storing information on a road network including installation positions, intersection positions, road traveling directions and road lengths of the vehicle speed measuring means and the traffic flow measuring means, 10. The vehicle average speed estimation according to claim 9, wherein a point adjacent to the upstream or downstream road of the arbitrary point and provided with a vehicle speed measurement unit and a traffic flow measurement unit is selected as the peripheral point. Method. 12. A vehicle speed measured by the vehicle speed measurement means at the peripheral point is Vi, a traffic volume of traffic flow data measured by the traffic flow measurement means is Qi, and a road occupancy time of the vehicle is Oi. The vehicle average speed estimation method according to claim 9, wherein the average vehicle length Li at the peripheral point is calculated according to Li = Vi · Oi / Qi. 13. A weighted average of the average vehicle length Li at each of the peripheral points so that the weight becomes greater as the average vehicle length of the peripheral points closer to the arbitrary point becomes greater. The vehicle average speed estimation method according to claim 12, wherein the length L 'is calculated. 14. The traffic volume of the traffic flow data measured by the traffic flow measurement means installed at the arbitrary point is Q ′,
Assuming that the road occupation time of the vehicle is O ', the average vehicle length L' at the arbitrary point is calculated by using the average vehicle length L 'at the arbitrary point and V' = L'Q '/ O'. The vehicle average speed estimating method according to claim 13, wherein: