JPH03246798A - Traffic flow variance monitor device - Google Patents
Traffic flow variance monitor deviceInfo
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- JPH03246798A JPH03246798A JP4490090A JP4490090A JPH03246798A JP H03246798 A JPH03246798 A JP H03246798A JP 4490090 A JP4490090 A JP 4490090A JP 4490090 A JP4490090 A JP 4490090A JP H03246798 A JPH03246798 A JP H03246798A
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- 238000001514 detection method Methods 0.000 claims description 45
- 238000005259 measurement Methods 0.000 claims description 36
- 238000012806 monitoring device Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
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Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、道路交通に関する情報を収集、解析し、道路
利用者に的確な情報を提供する交通流変動監視装置に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a traffic flow fluctuation monitoring device that collects and analyzes information regarding road traffic and provides accurate information to road users.
従来の技術
近年、ドライバーに対する情報提供サービスの要求が社
会的に高まるにつれて、それを支える交通管制装置の充
実が要求され、とりわけ交通流変動をより迅速に、より
正確に把握するための交通流変動監視装置の機能向上が
必要とされている。Conventional technology In recent years, as society's demand for information provision services for drivers has increased, there has been a demand for enhanced traffic control equipment to support this. There is a need for improved functionality in monitoring equipment.
以下、図面に基づいて従来の交通流変動監視装置につい
て説明する。Hereinafter, a conventional traffic flow fluctuation monitoring device will be explained based on the drawings.
第３図は従来の交通流変動監視装置の構成を示すブロッ
ク図である。FIG. 3 is a block diagram showing the configuration of a conventional traffic flow fluctuation monitoring device.
第３図において、１は路上に設置された例えば超音波セ
ンサ等の車両感知センサ、２は車両感知センサ１からの
車両感知信号を検出する信号検出部、３は地点別速度デ
ータ生成部であり、信号検出部２で検出した各測定地点
別の車両感知信号により、単位時間当たりの平均車速に
対応する車両速度データを生成する。In FIG. 3, 1 is a vehicle detection sensor such as an ultrasonic sensor installed on the road, 2 is a signal detection unit that detects a vehicle detection signal from the vehicle detection sensor 1, and 3 is a point-by-point speed data generation unit. , vehicle speed data corresponding to the average vehicle speed per unit time is generated based on the vehicle sensing signal for each measurement point detected by the signal detection unit 2.
４は地点別判定部であり、地点別速度データ生成部３で
生成された車両速度データを、あらかじめ定められた車
両速度に関するしきい値によりランク付けして、各地点
毎の交通流状態を判定する。Reference numeral 4 denotes a point-by-point determination section, which ranks the vehicle speed data generated by the point-by-point speed data generation section 3 based on a predetermined threshold value regarding vehicle speed, and determines the traffic flow state at each point. do.
５は区間判定部であり、地点別判定部４の判定結果を複
数の測定地点からなる区間毎に集計し、この集計値をあ
らかじめ定められた区間車両速度に関するしきい値によ
りランク付けして、各区間の交通流状態を判定する。Reference numeral 5 denotes a section determining section, which aggregates the determination results of the point-by-point determining section 4 for each section consisting of a plurality of measurement points, ranks the aggregated values based on a predetermined threshold value regarding the section vehicle speed, Determine the traffic flow condition for each section.
６は、区間判定部５の判定結果の経時変化を監視して交
通流の変動を判定する変動判定部、７は変動判定部６に
よる判定結果を出力する出力部である。Reference numeral 6 denotes a fluctuation determination section that monitors changes over time in the determination results of the section determination section 5 to determine changes in traffic flow, and 7 is an output section that outputs the determination results of the fluctuation determination section 6.
次に、上記従来例の動作について説明する。Next, the operation of the above conventional example will be explained.
路上を走行する車両が車両感知センサ１の感知範囲を通
過すると、信号検出部２が車両の通過を車両感知信号と
して検出する。この車両感知信号は、同一測定地点にお
いて同一進行方向に走行する複数の車線上の車両に関す
る車速を示すものであり、地点別速度データ生成部３に
おいて、例えば単位時間当たりの平均車速を表す各測定
地点単位の車両速度データに編集されて地点別判定部４
に送られる。When a vehicle traveling on a road passes through the sensing range of the vehicle detection sensor 1, the signal detection unit 2 detects the passage of the vehicle as a vehicle sensing signal. This vehicle detection signal indicates the vehicle speed of vehicles on a plurality of lanes traveling in the same direction of travel at the same measurement point, and the point-by-point speed data generation unit 3 collects each measurement representing the average vehicle speed per unit time, for example. Edited into point-by-point vehicle speed data and sent to point-by-point determination unit 4
sent to.
地点別判定部４では、あらかじめ定められた車両速度に
関するしきい値と前記車両速度データとを比較して、各
地点毎の交通流がスムーズであるか否か、及び、その程
度等についての判定を行い、その結果を区間判定部５に
送る。The point-by-point determination unit 4 compares the vehicle speed data with a predetermined threshold regarding vehicle speed to determine whether the traffic flow at each point is smooth and to what extent. and sends the result to the section determining section 5.
区間判定部５では、地点別判定部４で判定された結果を
複数の地点からなる区間毎に集計して、例えば区間別の
平均車速を表すデータに編集すると共に、あらかじめ定
められた区間速度に関するしきい値と上記編集データと
を比較して、各区間の交通流がスムーズであるか否か、
及び、その程度等についての判定を行い、その結果を変
動判定部６に送る。The section determination section 5 aggregates the results determined by the point-by-point determination section 4 for each section consisting of a plurality of points, and edits the results into data representing, for example, the average vehicle speed for each section, and also calculates data related to predetermined section speeds. Compare the threshold value with the above edited data to determine whether the traffic flow in each section is smooth or not.
Then, a determination is made regarding the degree of the change, etc., and the result is sent to the fluctuation determining section 6.
変動判定部６では、区間判定部５で判定された同一区間
における交通流状態の経時変化を監視して交通流の変動
を判定し、判定結果を出力部７から出力する。The fluctuation determining section 6 monitors changes over time in the traffic flow state in the same section determined by the section determining section 5, determines changes in traffic flow, and outputs the determination result from the output section 7.
このように、上記従来の交通流変動監視装置でも、車両
感知センサから得られる車両感知信号を加工することに
よって、交通流の変動を監視することができる。In this way, even with the conventional traffic flow fluctuation monitoring device described above, fluctuations in traffic flow can be monitored by processing the vehicle detection signal obtained from the vehicle detection sensor.
発明が解決しようとする課題
しかしながら、上記従来の交通流変動監視装置では、同
一測定地点における走行車両の単位時間当たりの平均車
速を、全車線まとめて割り出すのみであったので、同一
測定地点における各車線相互間の相対速度差を検出する
ことができなかった。Problems to be Solved by the Invention However, the conventional traffic flow fluctuation monitoring device described above only calculates the average vehicle speed per unit time of traveling vehicles at the same measurement point for all lanes. It was not possible to detect the relative speed difference between lanes.
このため、全車線にわたる本格的な交通流変動の伏線と
なる各車線相互間の交通流の相対的な変動を検出できず
、従って、渋滞の発生や解消を早く予測したり、事故等
の突発事象を早く検出することができないという問題点
があった。For this reason, it is not possible to detect relative fluctuations in traffic flow between lanes, which may hint at full-scale fluctuations in traffic flow across all lanes. There was a problem in that the event could not be detected quickly.
本発明は、上記従来の問題点を解決するものであり、交
通流の変動を迅速且つ的確に検知できる優れた交通流変
動監視装置を提供することを目的とするものである。The present invention solves the above-mentioned conventional problems, and aims to provide an excellent traffic flow fluctuation monitoring device that can quickly and accurately detect traffic flow fluctuations.
課題を解決するための手段
本発明は、上記目的を達成するために、各測定地点の各
車線毎に設置された車両感知センサからの車両感知信号
を検出する信号検出部と、この信号検出部により検出さ
れた車両感知信号によって各測定地点における各車線相
互間の相対的な交通流の変動を判定する車線間変動判定
手段と、信号検出部により検出された車両感知信号によ
って各測定地点別の車両速度データを生成する地点別速
度データ生成手段と、この地点別速度データ生成手段に
より生成された各測定地点別の車両速度データによって
各測定地点別の交通流状態を判定する地点別判定手段と
、車線間変動判定手段と地点別判定手段との判定結果に
よって複数の測定地点からなる区間の交通流の状態を判
定する区間総合判定手段と、この区間総合判定手段の判
定結果によって交通流の変動を判定する変動判定手段と
を備えるようにした。Means for Solving the Problems In order to achieve the above object, the present invention provides a signal detection unit that detects a vehicle detection signal from a vehicle detection sensor installed in each lane at each measurement point, and a signal detection unit that detects a vehicle detection signal from a vehicle detection sensor installed in each lane at each measurement point. inter-lane variation determination means for determining relative traffic flow fluctuations between lanes at each measurement point based on vehicle detection signals detected by the signal detector; A point-by-point speed data generation means for generating vehicle speed data; and a point-by-point determination means for determining a traffic flow state at each measurement point based on the vehicle speed data at each measurement point generated by the point-by-point speed data generation means. , a section comprehensive judgment means for judging the state of traffic flow in a section consisting of a plurality of measurement points based on the judgment results of the lane-to-lane variation judgment means and the point-by-point judgment means; and a fluctuation determination means for determining.
作用
本発明は上記構成により、各測定地点における車線相互
間の相対車速差の変化を検出することができ、従って、
全車線にわたる本格的な交通流変動の伏線となる各車線
相互間の交通流の相対的な変動を検出して、渋滞の発生
や解消を早く予測したり、事故等の突発事象を早く検出
することができる。Effect: With the above configuration, the present invention can detect changes in relative vehicle speed differences between lanes at each measurement point, and therefore,
Detects relative fluctuations in traffic flow between lanes, which hint at full-scale fluctuations in traffic flow across all lanes, to quickly predict the occurrence and resolution of congestion, and to quickly detect sudden events such as accidents. be able to.
実施例 以下、図面に基づいて本発明の一実施例を説明する。Example Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図は本発明の一実施例による交通流変動監視装置の
構成を示すブロック図である。FIG. 1 is a block diagram showing the configuration of a traffic flow fluctuation monitoring device according to an embodiment of the present invention.
第１図において、１１は、車両を感知するために路上の
各測定地点の走行車線と追越車線とに設置された、例え
ば超音波センサ等の車両感知センサ、１２は、各車両感
知センサ１１からの車両感知信号を検出して、感知車両
の速度を割り出す信号検出部である。In FIG. 1, reference numeral 11 indicates a vehicle detection sensor such as an ultrasonic sensor, which is installed in a driving lane and an overtaking lane at each measurement point on the road to detect a vehicle, and 12 indicates each vehicle detection sensor 11. This is a signal detection unit that detects a vehicle sensing signal from the vehicle and determines the speed of the sensed vehicle.
１３は車線間変動判足部であり、信号検出部１２にて割
り出された各車両の速度により、各測定地点における走
行車線と追越車線との平均速度差を算出し、この算出値
とあらかじめ定められた平均車速差に関する判定値とを
比較して、車線相互間の相対的な交通流変動を判定する
手段として設けられている。Reference numeral 13 denotes a lane variation judgment unit, which calculates the average speed difference between the driving lane and the overtaking lane at each measurement point based on the speed of each vehicle determined by the signal detection unit 12, and calculates the average speed difference between the driving lane and the overtaking lane at each measurement point. It is provided as a means for determining relative traffic flow fluctuations between lanes by comparing a determination value regarding a predetermined average vehicle speed difference.
１４は、信号検出部１２にて割り出された各車両の速度
により、各測定地点における単位時間当たりの平均車速
に対応する車両速度データを生成する手段としての地点
別速度データ生成部、１５は、各地点の車両速度データ
をあらかじめ定められた車両速度データに関するしきい
値と比較して、各測定地点別の交通流状態を判定する手
段としての地点別判定部である。14 is a point-by-point speed data generation section as means for generating vehicle speed data corresponding to the average vehicle speed per unit time at each measurement point based on the speed of each vehicle determined by the signal detection section 12; , a point-by-point determination unit that compares vehicle speed data at each point with a predetermined threshold value regarding vehicle speed data to determine the traffic flow state at each measurement point.
１６は区間総合判定部であり、所定の区間内における車
線間変動判足部１３と地点別判定部１５との判定結果の
組み合わせ値を、あらかじめ定められた区間交通流状態
に関するしきい値と比較して、所定の区間における交通
流の状態を判定する手段として設けられている。Reference numeral 16 denotes a section comprehensive judgment section, which compares the combined value of the judgment results of the lane-to-lane variation judgment section 13 and the point-by-point judgment section 15 within a predetermined section with a predetermined threshold value regarding the section traffic flow state. It is provided as a means for determining the state of traffic flow in a predetermined section.
１７は、区間総合判定部１６による判定結果の経時変化
を監視して交通流の変動を判定する手段としての変動判
定部、１８は変動判定部１７により判定された結果を出
力する出力部である。Reference numeral 17 designates a fluctuation determination unit as a means for determining changes in traffic flow by monitoring changes over time in the determination results by the section comprehensive determination unit 16, and reference numeral 18 designates an output unit that outputs the results determined by the fluctuation determination unit 17. .
次に、第１図及び第２図（ａ）、（ｂ）に基づいて上記
実施例の動作について説明する。Next, the operation of the above embodiment will be explained based on FIG. 1 and FIGS. 2(a) and 2(b).
路上を走行する車両が各車両感知センサ１１の感知範囲
を通過すると、信号検出部１２が車両の通過を車両感知
信号として検出する。この車両感知信号は、例えば、車
両感知センサ１１が車両を感知した時間に対応するハイ
レベルの車両存在信号と、車両を感知しなかった時間に
対応するロウレベルの車両非存在信号とからなるパルス
信号である。When a vehicle traveling on the road passes through the sensing range of each vehicle detection sensor 11, the signal detection unit 12 detects the passage of the vehicle as a vehicle sensing signal. This vehicle detection signal is, for example, a pulse signal consisting of a high-level vehicle presence signal corresponding to the time when the vehicle detection sensor 11 senses a vehicle, and a low-level vehicle non-presence signal corresponding to the time when the vehicle is not detected. It is.
信号検出部１２は、検出した車両感知信号のうち車両存
在信号部分のパルス長から各通過車両の車速を割り出し
、そのデータを車線間変動判足部１３と地点別速度デー
タ生成部１４とに送る。The signal detection unit 12 determines the vehicle speed of each passing vehicle from the pulse length of the vehicle presence signal portion of the detected vehicle sensing signal, and sends the data to the inter-lane variation determination unit 13 and the point-by-point speed data generation unit 14. .
車線間変動判足部１３では、信号検出部１２から送られ
た同一測定地点、同一進行方向の走行車線と追越車線と
を走行する車両の速度データにより、第２図（ａ）に示
すように単位時間当たりの走行車線と追越車線との平均
車速を割り出し、第２図（ｂ）に示すように２つの車線
における平均車速の差を算出する。The lane-to-lane variation determination section 13 uses the speed data of vehicles traveling in the same measurement point and the same direction of travel in the driving lane and overtaking lane sent from the signal detection section 12 to determine the speed as shown in FIG. 2(a). The average vehicle speed in the driving lane and the overtaking lane per unit time is determined, and the difference between the average vehicle speeds in the two lanes is calculated as shown in FIG. 2(b).
この算出値はあらかじめ定められた平均車速差に関する
判定値と比較され、算用値が判定値を上回った場合、走
行車線と追越車線との間に交通流の変動が生じたものと
判定する。ここで得られた判定結果は、例えば、変動の
有無及びその度合を示すランク等の形で区間総合判定部
１６に送られる。This calculated value is compared with a predetermined judgment value regarding the average vehicle speed difference, and if the calculated value exceeds the judgment value, it is judged that a change in traffic flow has occurred between the driving lane and the overtaking lane. . The determination result obtained here is sent to the section comprehensive determination unit 16 in the form of, for example, a rank indicating the presence or absence of fluctuation and its degree.
一方、地点別速度データ生成部１４では、信号検出部１
２から送られた同一測定地点、同一進行方向の走行車線
と追越車線とのそれぞれの速度データに基づいて平均速
度を割り出し、各測定地点別の車両速度データを生成す
る。On the other hand, in the point-by-point speed data generation section 14, the signal detection section 1
The average speed is determined based on the respective speed data of the same measurement point and the driving lane and the overtaking lane in the same direction of travel sent from 2, and vehicle speed data for each measurement point is generated.
この車両速度データは地点別判定部１５に送られ、ここ
で、あらかじめ定められた地点別速度データに関するし
きい値と比較されて、各測定地点別の交通流状態が判定
される。この判定結果は、車線間変動判足部１３の判定
結果と同様に、例えば、交通流の状態を示すランク等の
形で区間総合判定部１６に送られる。This vehicle speed data is sent to the point-by-point determination section 15, where it is compared with a predetermined threshold value regarding the point-by-point speed data to determine the traffic flow state at each measurement point. This determination result is sent to the section comprehensive determination section 16 in the same way as the determination result of the inter-lane variation determining section 13, for example, in the form of a rank indicating the state of traffic flow.
区間総合判定部１６に送られた車線間変動判足部１３と
地点別判定部１５との判定結果は、複数の測定地点から
なる区間毎にまとめられ、これにより区間毎の交通流の
状態を判定するための値が生成される。この値は、あら
かじめ定められた区間交通流状態に関するしきい値と比
較され、所定の区間に関する交通流の状態が判定される
。ここで得られた判定結果は、例えば、交通流の状態を
示すランク等の形で変動判定部１７に送られる。The judgment results from the lane-to-lane variation judgment section 13 and the point-by-point judgment section 15 sent to the section comprehensive judgment section 16 are summarized for each section consisting of a plurality of measurement points, thereby determining the traffic flow state for each section. A value for judgment is generated. This value is compared with a predetermined threshold value for the traffic flow condition in the section to determine the traffic flow condition for the predetermined section. The determination result obtained here is sent to the fluctuation determining section 17 in the form of, for example, a rank indicating the state of traffic flow.
このようにして送られてきた区間総合判定部１６の判定
結果は、変動判定部１７において過去の判定結果と比較
され、変動判定部１７は判定結果の経時変化を監視して
交通流の変動を判定し、その結果を出力部１８により出
力する。The judgment results sent in this way from the section comprehensive judgment section 16 are compared with past judgment results in the fluctuation judgment section 17, and the fluctuation judgment section 17 monitors changes in the judgment results over time to detect changes in traffic flow. The determination is made and the result is output by the output unit 18.
尚、本実施例においては、車両感知センサ１１として超
音波センサを用いたが、車両の走行状態を感知できるも
のであれば他のセンサを用いてもよい。In this embodiment, an ultrasonic sensor is used as the vehicle detection sensor 11, but other sensors may be used as long as they can detect the running state of the vehicle.
また、車両感知センサ１１から得られるデータとして車
両速度を用いたが、車線相互間の交通流変動や各測定地
点別の交通流状態を表すものであれば、他のデータでも
よい。同様に、車線間変動判足部１３と地点別判定部１
５とで用いるデータの種類が異なってもよい。Further, although vehicle speed is used as data obtained from the vehicle detection sensor 11, other data may be used as long as it represents traffic flow fluctuations between lanes or traffic flow conditions at each measurement point. Similarly, the inter-lane variation determining section 13 and the point-by-point determining section 1
The type of data used may be different between the two cases.
発明の効果
上述の如く本発明によれば、各測定地点の各車線毎に設
置された車両感知センサからの車両感知信号を検出する
信号検出部と、この信号検出部により検出された車両感
知信号によって各測定地点における各車線相互間の相対
的な交通流の変動を判定する車線間変動判定手段と、信
号検出部により検出された車両感知信号によって各測定
地点別の車両速度データを生成する地点別速度データ生
成手段と、二の地点別速度データ生成手段により生成さ
れた各測定地点別の車両速度データによって各測定地点
別の交通流状態を判定する地点別判定手段と、車線間変
動判定手段と地点別判定手段との判定結果によって複数
の測定地点からなる区間の交通流の状態を判定する区間
総合判定手段と、この区間総合判定手段の判定結果によ
って交通流の変動を判定する変動判定手段とを備えるよ
うにしたので、各測定地点における各車線相互間の相対
車速差の変化を検出することができる。Effects of the Invention As described above, according to the present invention, there is provided a signal detection section that detects a vehicle detection signal from a vehicle detection sensor installed in each lane at each measurement point, and a vehicle detection signal detected by the signal detection section. inter-lane variation determining means for determining the relative traffic flow variation between lanes at each measurement point; and a point for generating vehicle speed data for each measurement point based on the vehicle sensing signal detected by the signal detection unit. separate speed data generation means; point-by-point determination means for determining the traffic flow state at each measurement point based on the vehicle speed data at each measurement point generated by the second point-by-point speed data generation means; and lane-to-lane variation determination means and a section comprehensive determination means for determining the state of traffic flow in a section consisting of a plurality of measurement points based on the determination results of the section comprehensive determination means; and a fluctuation determination means for determining traffic flow fluctuations based on the determination results of the section comprehensive determination means. Therefore, it is possible to detect changes in relative vehicle speed differences between lanes at each measurement point.
従って、全車線にわたる本格的な交通流変動の伏線とな
る各車線相互間の相対的な交通流の変動を検出して、渋
滞の発生や解消を早く予測したり、事故等の突発事象を
早く検出することができる。Therefore, it is possible to detect relative traffic flow fluctuations between lanes, which can hint at full-scale traffic flow fluctuations across all lanes, to quickly predict the occurrence and resolution of congestion, and to quickly detect sudden events such as accidents. can be detected.
第１図は本発明の一実施例による交通流変動監視装置の
構成を示すブロック図、第２図（ａ）は第１図の車線間
変動判足部により割り出される単位時間当たりの走行車
線及び追越車線各々の平均車速を示す説明図、第２図（
ｂ）は同じく走行車線と追越車線との平均車速差を示す
説明図、第３図は従来の交通流変動監視装置の構成を示
すブロック図である。
１１・・・車両感知センサ、１２・・・信号検出部、１
３・・・車線間変動判足部、１４・・・地点別速度デー
タ生成部、１５・・・地点別判定部、１６・・・区間総
合判定部、１７・・・変動判定部。FIG. 1 is a block diagram showing the configuration of a traffic flow fluctuation monitoring device according to an embodiment of the present invention, and FIG. An explanatory diagram showing the average vehicle speed in each passing lane and Fig. 2 (
b) is an explanatory diagram showing the average vehicle speed difference between the driving lane and the overtaking lane, and FIG. 3 is a block diagram showing the configuration of a conventional traffic flow fluctuation monitoring device. 11... Vehicle detection sensor, 12... Signal detection unit, 1
3... Lane-to-lane variation judgment section, 14... Point-by-point speed data generation section, 15... Point-by-point judgment section, 16... Section comprehensive judgment section, 17... Fluctuation judgment section.
Claims (1)
らの車両感知信号を検出する信号検出部と、 前記信号検出部により検出された車両感知信号により、
各測定地点における各車線相互間の相対的な交通流の変
動を判定する車線間変動判定手段と、 前記信号検出部により検出された車両感知信号により、
各測定地点別の車両速度データを生成する地点別速度デ
ータ生成手段と、 前記地点別速度データ生成手段により生成された各測定
地点別の車両速度データにより、各測定地点別の交通流
状態を判定する地点別判定手段と、 前記車線間変動判定手段と地点別判定手段との判定結果
により、複数の測定地点からなる区間の交通流の状態を
判定する区間総合判定手段と、前記区間総合判定手段の
判定結果により、交通流の変動を判定する変動判定手段
とを備えた交通流変動監視装置。[Claims] A signal detection unit that detects a vehicle detection signal from a vehicle detection sensor installed for each lane at each measurement point; and a vehicle detection signal detected by the signal detection unit,
inter-lane variation determination means for determining relative traffic flow variation between lanes at each measurement point, and a vehicle sensing signal detected by the signal detection unit,
A point-by-point speed data generation means that generates vehicle speed data at each measurement point; and a traffic flow state at each measurement point is determined based on the vehicle speed data at each measurement point generated by the point-by-point speed data generation means. a point-by-point determination means for determining a traffic flow condition in a section consisting of a plurality of measurement points based on the determination results of the lane-to-lane variation determination means and the point-by-point determination means; A traffic flow fluctuation monitoring device comprising: a fluctuation determining means for determining a fluctuation in traffic flow based on a determination result.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4490090A JPH03246798A (en) | 1990-02-26 | 1990-02-26 | Traffic flow variance monitor device |
| DE69132668T DE69132668T2 (en) | 1990-02-26 | 1991-02-26 | System for monitoring traffic flow changes |
| PCT/JP1991/000244 WO1991013418A1 (en) | 1990-02-26 | 1991-02-26 | Traffic flow monitor apparatus |
| DE69129568T DE69129568T2 (en) | 1990-02-26 | 1991-02-26 | TRAFFIC MONITOR DEVICE |
| EP97119787A EP0825578B1 (en) | 1990-02-26 | 1991-02-26 | Traffic flow change monitoring system |
| EP91904651A EP0470268B1 (en) | 1990-02-26 | 1991-02-26 | Traffic flow change system |
| US07/768,295 US5281964A (en) | 1990-02-26 | 1991-02-26 | Traffic flow change monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4490090A JPH03246798A (en) | 1990-02-26 | 1990-02-26 | Traffic flow variance monitor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03246798A true JPH03246798A (en) | 1991-11-05 |
Family
ID=12704354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4490090A Pending JPH03246798A (en) | 1990-02-26 | 1990-02-26 | Traffic flow variance monitor device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03246798A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4945960A (en) * | 1972-09-07 | 1974-05-02 | ||
| JPS62113300A (en) * | 1985-11-12 | 1987-05-25 | オムロン株式会社 | Vehicle congestion alarm system |
-
1990
- 1990-02-26 JP JP4490090A patent/JPH03246798A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4945960A (en) * | 1972-09-07 | 1974-05-02 | ||
| JPS62113300A (en) * | 1985-11-12 | 1987-05-25 | オムロン株式会社 | Vehicle congestion alarm system |
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