EP0755039B1 - Method and system for the prognosis of traffic flow - Google Patents
Method and system for the prognosis of traffic flow Download PDFInfo
- Publication number
- EP0755039B1 EP0755039B1 EP96250138A EP96250138A EP0755039B1 EP 0755039 B1 EP0755039 B1 EP 0755039B1 EP 96250138 A EP96250138 A EP 96250138A EP 96250138 A EP96250138 A EP 96250138A EP 0755039 B1 EP0755039 B1 EP 0755039B1
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- Prior art keywords
- traffic
- data
- vehicles
- computer
- route
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
- G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
- G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
- G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
- G08G1/096741—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where the source of the transmitted information selects which information to transmit to each vehicle
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
- G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
- G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station
Definitions
- the invention relates to a method and system for predicting traffic flows selected locations or sections of a road network, in particular for Traffic control and route guidance of vehicles, with the determined traffic flow data, which contain at least traffic density information from a traffic computer that has a digital road map for forecasting the expected traffic flows can be used.
- WO 89/02142 describes a system for optimal use of a road network known that at selected locations or route sections over at least one Recording sensor has the traffic condition, in particular the traffic density, detected.
- the traffic status data is then sent to a control center, which is a Traffic calculator can be transmitted.
- the processing and processing takes place in the control center
- Preparation of the traffic condition data, which is then used for direct Traffic control can be used, for example, by direct information from the Car driver; the traffic control is based on a target-actual comparison the traffic condition data from selected locations or sections of route.
- the Target values correspond, for example, to the optimal traffic condition on the corresponding section of the road network.
- To better capture the Traffic flows become the traffic status data determined at different locations two measuring points e.g. subjected to a correlation analysis to get from it Statements etc. to get about the traffic flows.
- the invention provides that vehicles of a sample vehicle fleet each have their Determine and save current location position depending on time and / or route, so that the determined location positions as route data of the route traveled are available for an evaluation. At least part of the vehicles of the For this purpose, the sample vehicle fleet transmits the route data to you at intervals Traffic computer.
- the traffic computer determines from the currently recorded Route data, traffic flows and their composition, i.e. the Partial flows, which essentially make up the traffic flows, and assigns them to the selected locations or route sections. simultaneously serve the determined traffic flows and their composition for the determination and / or updating statistical traffic flow data from the traffic computer as time-dependent empirical values for the forecast of traffic flows be used.
- Driving activity data in a predetermined larger spatial area around the selected locations or sections of the route are recorded and sent to the traffic computer transmitted so that the traffic computer based on the driving activity data
- current driving activity data data can also be used, which is not in any case already represent actual driving activity, but only on an immediate one indicate upcoming driving activity (e.g. readiness display of a Mobile phones in a vehicle that is just starting).
- the traffic computer not only has a large number of vehicles Traffic flow data at certain times, but also about information about which traffic flows make up this traffic flow data.
- the Route data transmitted by the vehicles of the sample vehicle fleet contain information on the one hand, for example about the relative traffic density individual locations or sections of the route, but also information about which traffic flows cause this traffic density proportionately. That's the way it is possible, for example from the number of active motor vehicles in one predetermined larger spatial area around the selected locations or Route sections around that can be expected in the short or long term Traffic flows safely at the selected locations or sections of route predict.
- the route data are transmitted in a reduced form by redundant data are removed, for example when driving along a straight road or highway are included in the route data.
- the Transmission is conveniently via a radio telephone.
- Statistical traffic flow data is determined and / or updated Parameter-dependent if the traffic flows are forecast with greater certainty Need to become. For example, the traffic flow data becomes dependent determined and / or updated from the day of the week and the time of day.
- the current driving activity data expediently comprise the operating state of vehicles equipped with a driving activity sensor.
- the driving activity data is proposed by the invention Query and evaluate the activity of mobile phone networks.
- the ready display can be used when starting the vehicle. In this case there is no need to install special driving activity sensors.
- the size of the spatial area in which the imminent or Driving activities that are already running are expediently recorded in Depending on the population density.
- a system for performing the method has vehicles Sample vehicle fleet, each with means for determining the current Location position, for storing at least the route data and for transmission of data to a receiving unit fixedly arranged outside the vehicles exhibit.
- the driving activities are arranged by spatially distributed Driving activity sensors detected, which in turn have means for transmitting the recorded driving activity data to the fixedly arranged receiving unit.
- the system includes a traffic computer, a digital road map, a has electronic memory for storing empirical values and with the Receiving unit for receiving the vehicles from the sample vehicle fleet and data is transmitted to the driving activity sensors.
- the current position is expediently determined by a Receiver for signals from navigation satellite systems (e.g. GPS), since this is small in structure and the location is technically relative with sufficient accuracy can be easily determined.
- navigation satellite systems e.g. GPS
- the traffic computer Sending unit for sending requests to the driving activity sensors, so that the driving activity sensors via a receiving unit also provided can be controlled from the traffic computer. That way the traffic computer the possibility to collect the driving activity data if necessary.
- the vehicles of the sample vehicle fleet also a receiving unit for receiving requests from the Show traffic calculator.
- the driving activity sensors are installed in as many vehicles as possible and that the driving activity data in anonymous form, for example at the start of the vehicle are transmitted to the traffic computer.
- the driving activity sensors are also installed in vehicles that are not for example Sample vehicle fleet belong. But it is also conceivable that the Driving activity sensors e.g. stuck in the pavement of back streets within of a residential area are installed to record the number of active vehicles that with a certain probability staggered to the corresponding Traffic flows contribute to the selected locations or sections of the route.
- the vehicles also expediently have a sensor for detecting the current vehicle speed, the traffic flows can then be more accurate determined and linked directly to the vehicle density.
- the system for carrying out the procedure for forecasting traffic flows essentially comprises three subsystems: a sample vehicle fleet 10, spatially distributed driving activity sensors 20, in particular in the vehicles 11 of the sample vehicle fleet 10 can be installed, and a traffic computer 30.
- the spatially distributed driving activity sensors 20 can be act movable as well as stationary driving activity sensors 20. Is essential doing that driving activity sensors 20 spatially over a certain geographic Area are arranged in order to make the driving activities as "area-wide" as possible to capture.
- the subsystems can be interconnected in terms of data technology.
- the data connection to the traffic computer 30 are the vehicles 11 the sample vehicle fleet 10 each equipped with a transmitter Driving activity sensors 20 together with a transmitter form a device-related one Unit that automatically transmit driving activity data to the traffic computer 30 can.
- Traffic activity data is the traffic computer 30 with a corresponding one Receiving unit 31 provided.
- the receiving units of the Vehicles 11 of the sample vehicle fleet 10 and / or the driving activity sensors 20 be equipped with a receiving device. These receiving devices then enable the reception of requests from the traffic computer which the corresponding route and driving activity data with the corresponding Information needs, for example in difficult traffic situations on the corresponding sections of the route.
- the means installed in the vehicles of the sample vehicle fleet 10 include a device for determining the current location and expediently also the current vehicle speed, a memory for storage at least the route data and the above-mentioned Sending device for Transmission of data to the fixed outside of the vehicles 11 Traffic calculator 30.
- a device for determining the current location and expediently also the current vehicle speed a memory for storage at least the route data and the above-mentioned Sending device for Transmission of data to the fixed outside of the vehicles 11 Traffic calculator 30.
- To determine the current location and the current one Vehicle speed can be, for example, a receiver for signals from Navigation satellite systems in the vehicles of the sample vehicle fleet 10 be provided.
- the route is one in each of the vehicles 11 of the sample vehicle fleet 10 Storage unit provided, which is expedient in the sense of a ring storage system is organized and only the information over a limited period of time detected.
- the storage of the receiver for signals from Navigation satellite systems determined location positions and data transmission to the traffic computer 30 from a microprocessor integrated in the vehicle controlled.
- the transmitter unit installed in the vehicles 11 enables this Transmission of the route data to the traffic computer 30, the triggering the data transfer is carried out by the microprocessor.
- Traffic computer 30 The one arranged outside the vehicles 11 of the sample vehicle fleet 10 Traffic computer 30 is connected directly to a receiving unit 31. About these The routes of the vehicles 11 of the sample vehicle fleet are connected 10 passed to the traffic computer 30. To store the routes is the Traffic computer 30 equipped with appropriate storage units. One in Traffic computer 30 provided digital road map enables the assignment of Driving routes to the corresponding road sections. Those from the routes derived empirical values regarding the traffic flows and their Composition at selected locations or sections of a route Road networks are in a special storage unit of the traffic computer 30 stored.
- Driving activity sensors 20 can also be sensors that are not or not only record current driving activities of a vehicle, but such events capture that are related to upcoming driving activities. The upcoming driving activities can be done with a certain statistical Security related to the events captured.
- Driving activity sensors 20 are cellular telephones whose activity is within of a cellular telephone network is recorded and evaluated in order to make a statement about receive upcoming or current driving activities.
- they are "Driving activity sensors" not with a special transmission device for transmission equipped the activity data to the traffic computer 30, but that Cellular telephone network takes over the data transmission with its transmission units the traffic computer 30.
- Starting point of the process for forecasting traffic flows at selected Locations or sections of a road network are independent determining vehicles 11 of a sample vehicle fleet 10 which are within a Move road network.
- the movement of these vehicles 11 within the Road network takes place e.g. randomly and without special requirements.
- a receiver for signals from navigation satellite systems are in Vehicle constantly the current position and the current vehicle speed determined and successively together in a storage unit stored.
- These stored location positions represent the most important part of the Itinerary data, in particular the time of the respective Location determination can include. But it is also possible that the entire Route and thus the entire route data only one point in time or one Time period is assigned. There is a time assignment to the route data, if a time-dependent evaluation is planned.
- the route data will be from the vehicles 11 of the sample vehicle fleet 10 by means of the transmission unit transmit the fixed reception unit 31 of the traffic computer 30.
- the route data is transmitted time and / or route dependent, it can regularly or irregularly or on request.
- the Receiving unit 31 transfers the route data to the traffic computer 30, the initially stores them in a memory or memory area provided for this purpose.
- the route data are in each case the individual sections of the road network on the digital road map assigned.
- the traffic computer 30 determines the essential partial flows (Partial traffic flows) and the resulting traffic densities at least relative to a selected location or section of a road network to each other, i.e. it is the percentage of a partial flow in the total Traffic flow at a selected location or section of a route Road network determined.
- These traffic flow conditions are determined using the empirical values available in the memory, i.e. with the experience at taking into account the same time of a corresponding weekday special boundary conditions, compared and modified.
- a special one Boundary condition would be, for example, the start of school holidays on that day in a particular state and the like.
- the modification can e.g.
- the Evaluation is carried out by starting from the determined driving activity data, i.e. the driving activities, resulting from this with a certain statistical probability resulting partial flows (partial traffic flows) are derived. Again, this can based on empirical values stored in the memory.
- the forecast of traffic flows at selected locations or sections of route of a road network is then carried out using the from the driving activity data derived partial flows (partial traffic flows) based on the determined traffic flow conditions, essentially by extrapolating the locations or Traffic flow data assigned to route sections (traffic flow conditions) taking into account empirical values that are particularly time-dependent can. Based on the forecast traffic flows, suitable ones can then be found Measures to influence traffic or route guidance of vehicles take place.
- the method according to the invention mainly provides the traffic flow conditions at selected locations or sections of a road network; investigating the absolute traffic densities, as a rule, must pass through if required additional procedures are carried out.
- This determination of the absolute traffic density can but based on empirical values. It is also possible to some Distribute traffic density sensors in the road network and thus the traffic flow conditions to calibrate, i.e. selected locations or sections of route absolute Traffic densities based on the specific traffic flow conditions assigned.
Abstract
Description
Die Erfindung betrifft ein Verfahren und System zur Prognose von Verkehrsströmen an ausgewählten Orten oder Streckenabschnitten eines Straßennetzes, insbesondere zur Verkehrslenkung und Zielführung von Fahrzeugen, bei dem ermittelte Verkehrsstromdaten, die Informationen mindestens über die Verkehrsdichte enthalten, von einem Verkehrsrechner, der eine digitale Straßenkarte aufweist, zur Prognose der zu erwartenden Verkehrsströme herangezogen werden.The invention relates to a method and system for predicting traffic flows selected locations or sections of a road network, in particular for Traffic control and route guidance of vehicles, with the determined traffic flow data, which contain at least traffic density information from a traffic computer that has a digital road map for forecasting the expected traffic flows can be used.
Aus der WO 89/02142 ist ein System zur optimalen Nutzung eines Straßennetzes bekannt, das an ausgewählten Orten oder Streckenabschnitten über mindestens einen Aufnahmesensor verfügt, der den Verkehrszustand, insbesondere die Verkehrsdichte, erfaßt. Die Verkehrszustandsdaten werden anschließend an eine Leitstelle, welche ein Verkehrsrechner sein kann, übertragen. In der Leitstelle erfolgt die Verarbeitung und Aufbereitung der Verkehrszustandsdaten, die anschließend zur direkten Verkehrslenkung verwendet werden, beispielsweise durch direkte Information des Autofahrers; die Verkehrslenkung erfolgt auf der Grundlage eines Soll-Ist-Vergleichs der Verkehrszustandsdaten von ausgewählten Orten oder Streckenabschnitten. Die Soll-Werte entsprechen dabei beispielsweise dem optimalen Verkehrszustand auf dem entsprechenden Streckenabschnitt des Straßennetzes. Zur besseren Erfassung der Verkehrsströme werden die an verschiedenen Orten ermittelten Verkehrszustandsdaten zweier Meßstellen z.B. einer Korrelationsanalyse unterworfen, um daraus Aussagen u.a. über die Verkehrsströme zu erhalten.WO 89/02142 describes a system for optimal use of a road network known that at selected locations or route sections over at least one Recording sensor has the traffic condition, in particular the traffic density, detected. The traffic status data is then sent to a control center, which is a Traffic calculator can be transmitted. The processing and processing takes place in the control center Preparation of the traffic condition data, which is then used for direct Traffic control can be used, for example, by direct information from the Car driver; the traffic control is based on a target-actual comparison the traffic condition data from selected locations or sections of route. The Target values correspond, for example, to the optimal traffic condition on the corresponding section of the road network. To better capture the Traffic flows become the traffic status data determined at different locations two measuring points e.g. subjected to a correlation analysis to get from it Statements etc. to get about the traffic flows.
Nachteilig ist bei diesem System zur besseren Ausnutzung des bestehenden Straßennetzes, daß die Verkehrsströme nur unzureichend prognostiziert werden können, da insbesondere nur begrenzt ermittelbar ist, aus welchen Teilströmen sich die ermittelten Verkehrsströme zusammensetzen. Eine Prognose der Verkehrsströme an ausgewählten Orten oder Streckenabschnitten ist bei diesem System somit mit erheblicher Unsicherheit behaftet.The disadvantage of this system is that it makes better use of the existing one Road network that the traffic flows are forecast insufficiently can, since in particular it can only be determined to a limited extent from which partial flows compile the determined traffic flows. A forecast of traffic flows at selected locations or sections of the route is therefore part of this system considerable uncertainty.
Es ist Aufgabe der vorliegenden Erfindung, ein Verfahren und ein System anzugeben, das eine sicherere Prognose der Verkehrsströme an ausgewählten Orten oder Streckenabschnitten eines Straßennetzes ermöglicht und dadurch insbesondere eine effektive Verkehrslenkung und Zielführung von Fahrzeugen gestattet.It is an object of the present invention to provide a method and a system which enables a more reliable forecast of the traffic flows at selected locations or sections of a road network and thereby in particular allows effective traffic control and destination guidance of vehicles.
Die Lösung dieser Aufgabe hinsichtlich des Verfahrens ist erfindungsgemäß gekennzeichnet durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmale. Durch die kennzeichnenden Merkmale der Unteransprüche 2 bis 7 ist dieses Verfahren in vorteilhafter Weise weiter ausgestaltbar. Ein System zur Durchführung des erfindungsgemäßen Verfahrens weist die Merkmale des Patentanspruches 8 auf; durch die kennzeichnenden Merkmale der Unteransprüche 9 bis 13 ist dieses System in vorteilhafter Weise weiter ausgestaltbar.The solution to this problem with regard to the method is characterized according to the invention by the features specified in the characterizing part of patent claim 1. Due to the characterizing features of subclaims 2 to 7, this method can advantageously be further developed. A system for performing the method according to the invention has the features of claim 8; by the characterizing features of subclaims 9 to 13, this system can be further developed in an advantageous manner.
Die Erfindung sieht vor, daß Fahrzeuge einer Stichprobenfahrzeugflotte jeweils ihre aktuelle Ortsposition zeit- und/oder wegabhängig ermitteln und abspeichern, so daß die ermittelten Ortspositionen als Fahrtroutendaten der zurückgelegten Fahrtroute einer Auswertung zur Verfügung stehen. Mindestens ein Teil der Fahrzeuge der Stichprobenfahrzeugflotte überträgt dazu in Abständen die Fahrtroutendaten an einen Verkehrsrechner. Der Verkehrsrechner bestimmt aus den aktuell erfaßten Fahrtroutendaten die Verkehrsströme sowie ihre Zusammensetzung, d.h. die Teilströme, aus denen sich die Verkehrsströme im wesentlichen zusammensetzen, und ordnet diese den ausgewählten Orten oder Streckenabschnitten zu. Gleichzeitig dienen die ermittelten Verkehrsströme sowie ihre Zusammensetzung der Ermittlung und/oder Aktualisierung statistischer Verkehrsstromdaten, die vom Verkehrsrechner als zeitabhängige Erfahrungswerte für die Prognose der Verkehrsströme herangezogen werden. Zur Prognose der Verkehrsströme werden zusätzlich aktuelle Fahraktivitätsdaten in einem vorgegebenen größeren räumlichen Bereich um die ausgewählten Orte oder Streckenabschnitte herum erfaßt und an den Verkehrsrechner übertragen, so daß der Verkehrsrechner ausgehend von den Fahraktivitätsdaten die Prognose der Verkehrsströme an den ausgewählten Orten oder Streckenabschnitten durch Extrapolation der zugeordneten Verkehrsstromdaten unter Berücksichtigung der zeitabhängigen Erfahrungswerte ermitteln kann. Als aktuelle Fahraktivitätsdaten können auch Daten herangezogen werden, die nicht in jedem Fall bereits eine tatsächliche Fahraktivität repräsentieren, sondern erst auf eine unmittelbar bevorstehende Fahraktivität hindeuten (z.B. Bereitschaftsanzeige eines Mobilfunktelefons in einem Fahrzeug, welches gerade erst gestartet wird).The invention provides that vehicles of a sample vehicle fleet each have their Determine and save current location position depending on time and / or route, so that the determined location positions as route data of the route traveled are available for an evaluation. At least part of the vehicles of the For this purpose, the sample vehicle fleet transmits the route data to you at intervals Traffic computer. The traffic computer determines from the currently recorded Route data, traffic flows and their composition, i.e. the Partial flows, which essentially make up the traffic flows, and assigns them to the selected locations or route sections. simultaneously serve the determined traffic flows and their composition for the determination and / or updating statistical traffic flow data from the traffic computer as time-dependent empirical values for the forecast of traffic flows be used. Current forecasts are also used to forecast traffic flows Driving activity data in a predetermined larger spatial area around the selected locations or sections of the route are recorded and sent to the traffic computer transmitted so that the traffic computer based on the driving activity data Forecast traffic flows at the selected locations or sections of the route by extrapolation of the assigned traffic flow data taking into account the can determine time-dependent empirical values. As current driving activity data data can also be used, which is not in any case already represent actual driving activity, but only on an immediate one indicate upcoming driving activity (e.g. readiness display of a Mobile phones in a vehicle that is just starting).
Bei diesem Verfahren zur Prognose der Verkehrsströme anhand von Fahrtroutendaten einer Vielzahl von Fahrzeugen verfügt der Verkehrsrechner nicht nur über Verkehrsstromdaten zu bestimmten Zeitpunkten, sondern auch über Angaben darüber, aus welchen Verkehrsströmen sich diese Verkehrsstromdaten zusammensetzen. Die von den Fahrzeugen der Stichprobenfahrzeugflotte übermittelten Fahrtroutendaten enthalten einerseits Informationen beispielsweise über die relative Verkehrsdichte an einzelnen Orten oder Streckenabschnitten, andererseits aber auch Informationen darüber, welche Verkehrsströme diese Verkehrsdichte anteilig hervorrufen. So ist es möglich, beispielsweise aus der Zahl der aktiven Kraftfahrzeuge in einem vorgegebenen größeren räumlichen Bereich um die ausgewählten Orte oder Streckenabschnitte herum, die kurzfristig oder langfristig zu erwartenden Verkehrsströme an den ausgewählten Orten oder Streckenabschnitten sicher vorherzusagen.In this method for forecasting traffic flows based on route data the traffic computer not only has a large number of vehicles Traffic flow data at certain times, but also about information about which traffic flows make up this traffic flow data. The Route data transmitted by the vehicles of the sample vehicle fleet contain information on the one hand, for example about the relative traffic density individual locations or sections of the route, but also information about which traffic flows cause this traffic density proportionately. That's the way it is possible, for example from the number of active motor vehicles in one predetermined larger spatial area around the selected locations or Route sections around that can be expected in the short or long term Traffic flows safely at the selected locations or sections of route predict.
Um die Übertragungskanäle für die Übertragung der Fahrtroutendaten nicht zu überlasten, werden die Fahrtroutendaten in reduzierter Form übertragen, indem redundante Daten entfernt werden, die beispielsweise bei der Fahrt entlang einer geraden Straße oder Autobahn in den Fahrtroutendaten enthalten sind. Die Übertragung erfolgt zweckmäßigerweise über ein Funktelefon.In order not to use the transmission channels for the transmission of route data overload, the route data are transmitted in a reduced form by redundant data are removed, for example when driving along a straight road or highway are included in the route data. The Transmission is conveniently via a radio telephone.
Die Ermittlung und/oder Aktualisierung statistischer Verkehrsstromdaten erfolgt parameterabhängig, wenn die Verkehrsströme mit höherer Sicherheit prognostiziert werden müssen. So werden die Verkehrsstromdaten beispielsweise in Abhängigkeit vom Wochentag und von der Tageszeit ermittelt und/oder aktualisiert.Statistical traffic flow data is determined and / or updated Parameter-dependent if the traffic flows are forecast with greater certainty Need to become. For example, the traffic flow data becomes dependent determined and / or updated from the day of the week and the time of day.
Es ist zweckmäßig, die Fahrtroutendaten der zurückgelegten Fahrtroute und die Fahraktivitätsdaten unter bestimmten Bedingungen erst nach Aufforderung durch den Verkehrsrechner an diesen zu übertragen. It is advisable to include the route data of the route traveled and the Driving activity data under certain conditions only after request by the Traffic calculator to transmit to this.
Zweckmäßigerweise umfassen die aktuellen Fahraktivitätsdaten den Betriebszustand der Fahrzeuge, die mit einem Fahraktivitätssensor ausgestattet sind.The current driving activity data expediently comprise the operating state of vehicles equipped with a driving activity sensor.
Mit Vorteil wird durch die Erfindung vorgeschlagen, die Fahraktivitätsdaten durch Abfrage und Auswertung der Aktivität von Mobilfunktelefonnetzen zu erfassen. Hierfür läßt sich insbesondere die Bereitschaftsanzeige beim Starten des Fahrzeugs nutzen. In diesem Fall erübrigt sich die Installation von speziellen Fahraktivitätssensoren.Advantageously, the driving activity data is proposed by the invention Query and evaluate the activity of mobile phone networks. Therefor In particular, the ready display can be used when starting the vehicle. In this case there is no need to install special driving activity sensors.
Die Größe des räumlichen Bereichs, in dem die unmittelbar bevorstehenden oder bereits laufenden Fahraktivitäten erfaßt werden, wird zweckmäßigerweise in Abhängigkeit von der Besiedlungsdichte vorgegeben.The size of the spatial area in which the imminent or Driving activities that are already running are expediently recorded in Depending on the population density.
Ein System zur Durchführung des Verfahrens weist Fahrzeuge einer Stichprobenfahrzeugflotte auf, die jeweils Mittel zur Bestimmung der aktuellen Ortsposition, zur Speicherung mindestens der Fahrtroutendaten und zur Übertragung von Daten an eine außerhalb der Fahrzeuge fest angeordnete Empfangseinheit aufweisen. Die Fahraktivitäten werden durch räumlich verteilt angeordnete Fahraktivitätssensoren erfaßt, die wiederum Mittel aufweisen zur Übertragung der erfaßten Fahraktivitätsdaten an die fest angeordnete Empfangseinheit. Darüber hinaus umfaßt das System einen Verkehrsrechner, der eine digitale Straßenkarte, einen elektronischen Speicher zur Speicherung von Erfahrungswerten aufweist und mit der Empfangseinheit zum Empfang der von den Fahrzeugen der Stichprobenfahrzeugflotte und den Fahraktivitätssensoren übertragenden Daten verbunden ist.A system for performing the method has vehicles Sample vehicle fleet, each with means for determining the current Location position, for storing at least the route data and for transmission of data to a receiving unit fixedly arranged outside the vehicles exhibit. The driving activities are arranged by spatially distributed Driving activity sensors detected, which in turn have means for transmitting the recorded driving activity data to the fixedly arranged receiving unit. Furthermore the system includes a traffic computer, a digital road map, a has electronic memory for storing empirical values and with the Receiving unit for receiving the vehicles from the sample vehicle fleet and data is transmitted to the driving activity sensors.
Die Bestimmung der aktuellen Ortsposition erfolgt zweckmäßigerweise durch einen Empfänger für Signale von Navigations-Satelliten-Systemen (z.B. GPS), da dieser klein im Aufbau ist und die Ortsposition mit hinreichender Genauigkeit technisch relativ einfach bestimmt werden kann.The current position is expediently determined by a Receiver for signals from navigation satellite systems (e.g. GPS), since this is small in structure and the location is technically relative with sufficient accuracy can be easily determined.
In Ausgestaltung der Erfindung ist es vorgesehen, daß der Verkehrsrechner eine Sendeeinheit zum Senden von Anforderungen an die Fahraktivitätssensoren aufweist, so daß die Fahraktivitätssensoren über eine ebenfalls vorgesehene Empfangseinheit vom Verkehrsrechner aus gesteuert werden können. Auf diese Art und Weise erhält der Verkehrsrechner die Möglichkeit, die Fahraktivitätsdaten bei Bedarf einzuholen. In an embodiment of the invention it is provided that the traffic computer Sending unit for sending requests to the driving activity sensors, so that the driving activity sensors via a receiving unit also provided can be controlled from the traffic computer. That way the traffic computer the possibility to collect the driving activity data if necessary.
Darüber hinaus ist es vorteilhaft, wenn die Fahrzeuge der Stichprobenfahrzeugflotte ebenfalls eine Empfangseinheit zum Empfang von Anforderungen des Verkehrsrechners aufweisen.In addition, it is advantageous if the vehicles of the sample vehicle fleet also a receiving unit for receiving requests from the Show traffic calculator.
Um eine sichere Prognose der Verkehrsströme zu gewährleisten, ist es vorgesehen, daß die Fahraktivitätssensoren möglichst in einer Vielzahl von Fahrzeugen installiert sind und daß die Fahraktivitätsdaten in anonymisierter Form beispielsweise beim Start des Fahrzeugs an den Verkehrsrechner übertragen werden. Die Fahraktivitätssensoren sind beispielsweise auch in Fahrzeugen installiert, die nicht zur Stichprobenfahrzeugflotte gehören. Es ist aber auch denkbar, daß die Fahraktivitätssensoren z.B. fest in der Straßendecke von Nebenstraßen innerhalb eines Wohngebiets installiert sind, um die Zahl der aktiven Fahrzeuge zu erfassen, die mit einer gewissen Wahrscheinlichkeit zeitlich versetzt zu den entsprechenden Verkehrsströmen an den ausgewählten Orten oder Streckenabschnitten beitragen.In order to ensure a reliable forecast of traffic flows, that the driving activity sensors are installed in as many vehicles as possible and that the driving activity data in anonymous form, for example at the start of the vehicle are transmitted to the traffic computer. The driving activity sensors are also installed in vehicles that are not for example Sample vehicle fleet belong. But it is also conceivable that the Driving activity sensors e.g. stuck in the pavement of back streets within of a residential area are installed to record the number of active vehicles that with a certain probability staggered to the corresponding Traffic flows contribute to the selected locations or sections of the route.
Zweckmäßigerweise weisen die Fahrzeuge auch einen Sensor zur Erfassung der momentanen Fahrzeuggeschwindigkeit auf, die Verkehrsströme können dann genauer ermittelt und direkt mit der Fahrzeugdichte verknüpft werden.The vehicles also expediently have a sensor for detecting the current vehicle speed, the traffic flows can then be more accurate determined and linked directly to the vehicle density.
Anhand des in der einzigen Figur dargestellten Systems zur Prognose der Verkehrsströme an ausgewählten Orten oder Streckenabschnitten eines Straßennetzes wird die Erfindung nachfolgend exemplarisch näher erläutert.Using the system shown in the single figure to forecast the Traffic flows at selected locations or sections of a route Road network, the invention is exemplarily explained in more detail below.
Das System zur Durchführung des Verfahrens zur Prognose der Verkehrsströme
umfaßt im wesentlichen drei Teilsysteme: Eine Stichprobenfahrzeugflotte 10, räumlich
verteilt angeordnete Fahraktivitätssensoren 20, die insbesondere in den Fahrzeugen
11 der Stichprobenfahrzeugflotte 10 installiert sein können, und einen Verkehrsrechner
30. Bei den räumlich verteilt angeordneten Fahraktivitätssensoren 20 kann es sich um
bewegliche als auch um ortsfeste Fahraktivitätssensoren 20 handeln. Wesentlich ist
dabei, daß Fahraktivitätssensoren 20 räumlich über einen gewissen geographischen
Bereich verteilt angeordnet sind, um die Fahraktivitäten möglichst "flächendeckend" zu
erfassen. Die Teilsysteme sind datentechnisch miteinander verbindbar. Zur Herstellung
der datentechnischen Verbindung mit dem Verkehrsrechner 30 sind die Fahrzeuge 11
der Stichprobenfahrzeugflotte 10 jeweils mit einem Sendegerät ausgestattet Auch die
Fahraktivitätssensoren 20 bilden zusammen mit einem Sender eine gerätetechnische
Einheit, die selbsttätig Fahraktivitätsdaten an den Verkehrsrechner 30 übermitteln
kann. Zum Empfang der Fahrtroutendaten der Fahrzeuge 11 der
Stichprobenfahrzeugflotte 10 und der von den Fahraktivitätssensoren 20 erfaßten
Fahraktivitätsdaten ist der Verkehrsrechner 30 mit einer entsprechenden
Empfangseinheit 31 versehen. Zusätzlich können die Empfangseinheiten der
Fahrzeuge 11 der Stichprobenfahrzeugflotte 10 und/oder der Fahraktivitätssensoren
20 mit einer Empfangseinrichtung ausgerüstet sein. Diese Empfangseinrichtungen
ermöglichen dann den Empfang von Anforderungen des Verkehrsrechners, der die
entsprechenden Fahrtrouten- und Fahraktivitätsdaten bei entsprechendem
Informationsbedarf, beispielsweise bei schwierigen Verkehrssituationen auf den
entsprechenden Streckenabschnitten, abrufen kann.The system for carrying out the procedure for forecasting traffic flows
essentially comprises three subsystems: a
Die in den Fahrzeugen der Stichprobenfahrzeugflotte 10 installierten Mittel umfassen
ein Gerät zur Bestimmung der aktuellen Ortsposition und zweckmäßigerweise auch
der momentanen Fahrzeuggeschwindigkeit, einen Speicher zur Speicherung
mindestens der Fahrtroutendaten und die bereits o.g. Sendeeinrichtung zur
Übertragung von Daten an den außerhalb der Fahrzeuge 11 fest angeordneten
Verkehrsrechner 30. Zur Bestimmung der aktuellen Ortsposition und der momentanen
Fahrzeuggeschwindigkeit kann beispielsweise ein Empfänger für Signale von
Navigations-Satelliten-Systemen in den Fahrzeugen der Stichprobenfahrzeugflotte 10
vorgesehen sein. Die Erfassung der momentanen Fahrzeuggeschwindigkeit kann
selbstverständlich auch durch separate Sensoren (z.B. Tachometer) erfolgen; die
Verkehrsströme an ausgewählten Orten oder Streckenabschnitten können dann
genauer ermittelt und direkt mit der Fahrzeugdichte verknüpft werden (Anzahl
Fahrzeuge = mittlere Geschwindigkeit pro Fahrzeugdichte).The means installed in the vehicles of the
Zur Speicherung der Fahrtroutendaten der von einem Fahrzeug 11 zurückgelegten
Strecke ist in den Fahrzeugen 11 der Stichprobenfahrzeugflotte 10 jeweils eine
Speichereinheit vorgesehen, die zweckmäßig im Sinne eines Ringspeichersystems
organisiert ist und lediglich die Informationen über einen begrenzten Zeitraum hinweg
erfaßt. Zweckmäßigerweise wird die Speicherung der vom Empfänger für Signale von
Navigations-Satelliten-Systemen ermittelten Ortspositionen und die Datenübertragung
an den Verkehrsrechner 30 von einem im Fahrzeug integrierten Mikroprozessor
gesteuert. Die in den Fahrzeugen 11 installierte Sendeeinheit ermöglicht die
Übertragung der Fahrtroutendaten an den Verkehrsrechner 30, wobei die Auslösung
der Datenübertragung durch den Mikroprozessor erfolgt.For storing the travel route data of a
Der außerhalb der Fahrzeuge 11 der Stichprobenfahrzeugflotte 10 angeordnete
Verkehrsrechner 30 ist direkt mit einer Empfangseinheit 31 verbunden. Über diese
Verbindung werden die Fahrtrouten der Fahrzeuge 11 der Stichprobenfahrzeugflotte
10 an den Verkehrsrechner 30 übergeben. Zur Ablage der Fahrtrouten ist der
Verkehrsrechner 30 mit entsprechenden Speichereinheiten ausgerüstet. Eine im
Verkehrsrechner 30 vorgesehene digitale Straßenkarte ermöglicht die Zuordnung der
Fahrtrouten zu den dazugehörenden Straßenabschnitten. Die aus den Fahrtrouten
abgeleiteten Erfahrungswerte bezüglich der Verkehrsströme und deren
Zusammensetzung an ausgewählten Orten oder Streckenabschnitten eines
Straßennetzes sind in einer speziellen Speichereinheit des Verkehrsrechners 30
abgelegt.The one arranged outside the
Um Fahraktivitäten in einem vorgegebenen größeren Bereich um einen ausgewählten
Ort oder Streckenabschnitt herum erfassen zu-können, sind Fahraktivitätssensoren 20
in diesem Bereich räumlich verteilt angeordnet. Räumlich verteilt ist dabei nicht
statisch zu verstehen, da es sich bei den Fahraktivitätssensoren 20 beispielsweise um
in Fahrzeugen installierte Sensoren handeln kann, die den Betriebszustand des
Fahrzeugs erfassen und sofort oder unter bestimmten vorgegebenen oder
vorgebbaren Bedingungen an den Verkehrsrechner 30 übertragen können. Bei den
Fahraktivitätssensoren 20 kann es sich auch um Sensoren handeln, die nicht oder
nicht nur aktuelle Fahraktivitäten eines Fahrzeugs erfassen, sondern solche Ereignisse
erfassen, die mit bevorstehenden Fahraktivitäten zusammenhängen. Die
bevorstehenden Fahraktivitäten können dabei mit einer gewissen statistischen
Sicherheit mit den erfaßten Ereignissen zusammenhängen. So kann es sich bei den
Fahraktivitätssensoren 20 um Mobilfunk-Telefone handeln, deren Aktivität innerhalb
eines Mobilfunk-Telefonnetzes erfaßt und ausgewertet wird, um eine Aussage über
bevorstehende oder aktuelle Fahraktivitäten zu erhalten. In diesem Falle sind die
"Fahraktivitätssensoren" nicht mit einer speziellen Sendeeinrichtung zur Übertragung
der erfaßten Aktivitätsdaten an den Verkehrsrechner 30 ausgerüstet, sondern das
Mobilfunk-Telefonnetz übernimmt mit seinen Sendeeinheiten die Datenübertragung an
den Verkehrsrechner 30. To drive activities in a given larger area around a selected one
To be able to detect the location or section of the route are
Ausgangspunkt des Verfahrens zur Prognose der Verkehrsströme an ausgewählten
Orten oder Streckenabschnitten eines Straßennetzes sind ihre Fahrtroute selbsttätig
ermittelnde Fahrzeuge 11 einer Stichprobenfahrzeugflotte 10, die sich innerhalb eines
Straßennetzes bewegen. Die Bewegung dieser Fahrzeuge 11 innerhalb des
Straßennetzes erfolgt dabei z.B. zufällig und ohne spezielle Vorgaben. Mittels z.B.
eines Empfängers für Signale von Navigations-Satelliten-Systemen werden im
Fahrzeug ständig die aktuelle Ortsposition und die momentane Fahrzeuggeschwindigkeit
ermittelt und nacheinander zusammen in einer Speichereinheit
abgelegt. Diese gespeicherten Ortspositionen stellen den wichtigsten Teil der
Fahrtroutendaten dar, zu denen insbesondere noch der Zeitpunkt der jeweiligen
Ortspositionsermittlung gehören kann. Es ist aber auch möglich, daß der gesamten
Fahrtroute und damit den gesamten Fahrtroutendaten nur ein Zeitpunkt oder eine
Zeitspanne zugeordnet wird. Eine Zeitzuordnung zu den Fahrtroutendaten erfolgt,
wenn eine zeitabhängige Auswertung vorgesehen ist. Die Fahrtroutendaten werden
mittels der Sendeeinheit von den Fahrzeugen 11 der Stichprobenfahrzeugflotte 10 an
die fest angeordnete Empfangseinheit 31 des Verkehrsrechners 30 übertragen. Die
Übertragung der Fahrtroutendaten erfolgt zeit- und/oder wegabhängig, sie kann
regelmäßig oder unregelmäßig oder aber auch auf Anforderung erfolgen. Die
Empfangseinheit 31 übergibt die Fahrtroutendaten an den Verkehrsrechner 30, der
diese zunächst in einem dafür vorgesehenen Speicher oder Speicherbereich ablegt.Starting point of the process for forecasting traffic flows at selected
Locations or sections of a road network are independent
determining
Zur Auswertung durch den Verkehrsrechner 30 werden die Fahrtroutendaten jeweils
den einzelnen Streckenabschnitten des Straßennetzes auf der digitalen Straßenkarte
zugeordnet. Danach bestimmt der Verkehrsrechner 30 die wesentlichen Teilströme
(Teil-Verkehrsströme) und die dadurch bewirkten Verkehrsdichten an mindestens
einem ausgewählten Ort oder Streckenabschnitt eines Straßennetzes relativ
zueinander, d.h. es wird jeweils der prozentuale Anteil eines Teilstroms am gesamten
Verkehrsstrom an einem ausgewählten Ort oder Streckenabschnitt eines
Straßennetzes ermittelt. Diese so ermittelten Verkehrsstromverhältnisse werden mit
den im Speicher vorliegenden Erfahrungswerten, d.h. mit den Erfahrungswerten zum
gleichen Zeitpunkt eines entsprechenden Wochentags unter Berücksichtigung
spezieller Randbedingungen, verglichen und modifiziert. Eine spezielle
Randbedingung wäre beispielsweise der Beginn von Schulferien an diesem Tag in
einem bestimmten Bundesland und dergleichen mehr. Die Modifizierung kann z.B.
dadurch erfolgen, daß eine spezielle Mittelung durchgeführt wird, bei der das
gewichtete Mittel aus den aktuellen Verkehrsstromverhältnissen und den "Erfahrungs-Verkehrsstromverhältnissen"
an dem ausgewählten Ort oder Streckenabschnitt zu
einem solchen Zeitpunkt an einem entsprechenden Wochentag unter Berücksichtigung
spezieller Randbedingungen gebildet wird. Danach erfolgt zweckmäßigerweise eine
Aktualisierung der zeitabhängigen "Erfahrungs-Verkehrsstromverhältnisse" durch den
Verkehrsrechner 30, beispielsweise ebenfalls durch gewichtete Mittelung.For the evaluation by the
Parallel zur Erfassung, Übertragung und Auswertung der Fahrtroutendaten werden die
von den Fahraktivitätssensoren 20 in einem vorgegebenen größeren Bereich um einen
ausgewählten Ort oder Streckenabschnitt herum ermittelten Fahraktivitätsdaten an die
Empfangseinheit 31 übertragen, von der Empfangseinheit 31 an den Verkehrsrechner
30 übergeben und vom Verkehrsrechner 30 in einem dafür vorgesehenen Speicher
oder Speicherbereich abgelegt und zu einem geeigneten Zeitpunkt ausgewertet. Die
Auswertung erfolgt, indem ausgehend von den ermittelten Fahraktivitätsdaten, d.h.
den Fahraktivitäten, sich daraus mit einer gewissen statistischen Wahrscheinlichkeit
ergebende Teilströme (Teil-Verkehrsströme) abgeleitet werden. Dies kann wiederum
anhand von im Speicher abgelegten Erfahrungswerten erfolgen.Parallel to the acquisition, transmission and evaluation of the route data, the
by the driving
Die Prognose der Verkehrsströme an ausgewählten Orten oder Streckenabschnitten eines Straßennetzes erfolgt dann mit Hilfe der aus den Fahraktivitätsdaten abgeleiteten Teilströme (Teil-Verkehrsströme) anhand der ermittelten Verkehrsstromverhältnisse, also im wesentlichen durch Extrapolation der den Orten oder Streckenabschnitten zugeordneten Verkehrsstromdaten (Verkehrsstromverhältnisse) unter Berücksichtigung von Erfahrungswerten, die insbesondere zeitabhängig sein können. Anhand der prognostizierten Verkehrsströme können anschließend geeignete Maßnahmen der Verkehrsbeeinflussung oder Zielführung von Fahrzeugen erfolgen.The forecast of traffic flows at selected locations or sections of route of a road network is then carried out using the from the driving activity data derived partial flows (partial traffic flows) based on the determined traffic flow conditions, essentially by extrapolating the locations or Traffic flow data assigned to route sections (traffic flow conditions) taking into account empirical values that are particularly time-dependent can. Based on the forecast traffic flows, suitable ones can then be found Measures to influence traffic or route guidance of vehicles take place.
Das erfindungsgemäße Verfahren liefert hauptsächlich die Verkehrsstromverhältnisse an ausgewählten Orten oder Streckenabschnitten eines Straßennetzes; das Ermitteln der absoluten Verkehrsdichten muß, wenn diese benötigt werden, in der Regel durch ergänzende Verfahren erfolgen. Diese Bestimmung der absoluten Verkehrsdichte kann aber anhand von Erfahrungswerten vorgenommen werden. Auch ist es möglich, einige Verkehrsdichte-Sensoren im Straßennetz zu verteilen und damit die Verkehrsstromverhältnisse zu eichen, also ausgewählten Orten oder Streckenabschnitten absolute Verkehrsdichten auf der Grundlage der bestimmten Verkehrsstromverhältnisse zuzuordnen. The method according to the invention mainly provides the traffic flow conditions at selected locations or sections of a road network; investigating the absolute traffic densities, as a rule, must pass through if required additional procedures are carried out. This determination of the absolute traffic density can but based on empirical values. It is also possible to some Distribute traffic density sensors in the road network and thus the traffic flow conditions to calibrate, i.e. selected locations or sections of route absolute Traffic densities based on the specific traffic flow conditions assigned.
- StichprobenfahrzeugflotteFleet of sample vehicles
- 1010
- Fahrzeugevehicles
- 1111
- FahraktivitätssensorenDriving activity sensors
- 2020
- Verkehrsrechnertraffic computer
- 3030
- Empfangseinheitreceiver unit
- 3131
Claims (13)
- Method of predicting traffic flows at selected locations or road sections of a road network, particularly for the purpose of traffic control and the guidance of vehicles to a destination; in which ascertained traffic flow data, containing information on at least the density of the traffic, is used by a traffic computer with a digital road map for the prediction of the traffic flows which are to be expected,in which process the vehicles of a sample vehicle fleet constantly ascertain their current location and store the route covered in the form of route data andat least some of the vehicles transmit their route data to the traffic computer at intervals,the traffic computer establishes the traffic flow data from the route data, assigns these traffic flow data to the selected locations or road sections, and uses them as time-dependent empirical values to establish and/or update statistical traffic flow data.within a predetermined, fairly large spatial area around the selected locations or road sections, current traffic activity data are gathered by mobile or fixed traffic activity sensors and transmitted to the traffic computer, andthe traffic computer predicts the traffic flows at the selected locations or road sections, on the basis of the traffic activity data gathered in the predetermined fairly large spatial area around the selected locations or road sections, by extrapolating the assigned traffic flow data, taking into account the time-dependent empirical values.
- Method as in Claim 1
characterised in that
the route data of the route covered are transmitted in reduced form prior to transmission to the traffic computer. - Method as in Claim 1 or 2
characterised in that
the traffic computer ascertains and/or updates statistical traffic flow data in dependence on predetermined parameters. - Method as in one of Claims 1 to 3
characterised in that
the route data of the route covered, and the traffic activity data, are transmitted to the traffic computer at the request of the latter. - Method as in one of Claims 1 to 4
characterised in that
the current traffic activity data show the operating status of a vehicle. - Method as in one of Claims 1 to 5
characterised in that
the traffic activity data are gathered by requesting and evaluating the activity of mobile telephone networks. - Method as in one of Claims 1 to 6
characterised in that
the spatial area in which the traffic activity is gathered is predetermined in dependence on the density of population. - System for implementing the method as in Claim 1, consisting of vehicles (11) of a sample vehicle fleet (10) which have means of establishing their current location, for storing at least their locational positions in the form of route data, and for transmitting the route data to a receiver unit (31) which is independent of the vehicles (11), and traffic activity sensors (20) distributed spatially, which have means of transmitting, to the receiver unit (31), the traffic activity data collected; and
a traffic computer (30), which has a digital road map and an electronic memory for storing data, and which is connected to the receiver unit (31) in order to receive the data transmitted by the vehicles (11) of the sample vehicle fleet (10) and by the traffic activity sensors. - System as in Claim 8
characterised in that
in order to ascertain their current location, the vehicles (11) have a receiver for signals from navigation satellite systems. - System as in Claim 8 or 9
characterised in that
the traffic computer (30) has a transmitter unit for transmitting, and the traffic activity sensors (20) have a receiver system for receiving, requests from the traffic computer for the transfer of data. - System as in one of Claims 8 to 10
characterised in that
the vehicles (11) of the sample vehicle fleet (10) have a receiver system for receiving requests from the traffic computer for the transfer of data. - System as in one of Claims 8 to 11
characterised in that
the ready-status indication of mobile telephones in a large number of vehicles is used as traffic activity sensors. - System as in Claim 8
characterised in that
the vehicles (11) have a sensor to record the current speed of the vehicle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19526148A DE19526148C2 (en) | 1995-07-07 | 1995-07-07 | Method and system for forecasting traffic flows |
| DE19526148 | 1995-07-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0755039A2 EP0755039A2 (en) | 1997-01-22 |
| EP0755039A3 EP0755039A3 (en) | 1997-01-29 |
| EP0755039B1 true EP0755039B1 (en) | 2002-12-04 |
Family
ID=7767121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96250138A Expired - Lifetime EP0755039B1 (en) | 1995-07-07 | 1996-06-26 | Method and system for the prognosis of traffic flow |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5812069A (en) |
| EP (1) | EP0755039B1 (en) |
| AT (1) | ATE229211T1 (en) |
| DE (2) | DE19526148C2 (en) |
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- 1996-06-26 DE DE59609937T patent/DE59609937D1/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
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| US5812069A (en) | 1998-09-22 |
| DE59609937D1 (en) | 2003-01-16 |
| ATE229211T1 (en) | 2002-12-15 |
| DE19526148A1 (en) | 1997-02-06 |
| DE19526148C2 (en) | 1997-06-05 |
| EP0755039A3 (en) | 1997-01-29 |
| EP0755039A2 (en) | 1997-01-22 |
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