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  • Public Transport Priority at Traffic Lights

    Laurent BREHERET - SODIT

    SODIT - Beijing - Octobre 2007 1

  • General concepts for PT priorityA PT priority system aims at coordinating a set of actions, each of them favoring Public Transport while crossing junctions against all other usersTwo categories of actions have to be undertaken :

    Static PriorityDynamic Priority

    SODIT - Beijing - Octobre 2007 2

  • Static PriorityPriority Vehicles are considered when traffic signal plan is calculatedSignal Plan minimise their theoretical waiting time : green wave based on their usual speedWhere to use it :

    Routes with high PT frequencyFew variations of traffic

    SODIT - Beijing - Octobre 2007 3

  • Dynamic PriorityOn-line adaptation of the signal plan (microregulation) in order to favour PTDone by the traffic controlerWell-suited when traffic conditions are changing rapidly, and when frequency of prioritary vehicles is lowTwo categories of actions:

    Earlier or longer compatible green phaseInsertion of a green phase dedicated to PT

    SODIT - Beijing - Octobre 2007 4

  • Impact of PT Priority on trafficPT frequency, traffic volumes and design and capacity of junctions have a great impact on priority efficiency/performanceGenerally, the higher benefits for the PT, the greater degradation for other road usersThe computation of signal plans and determination of activation rules are of the greatest importance

    SODIT - Beijing - Octobre 2007 5

  • Efficient approach for PVSpecific road design can improve the approach of priority vehicles to the junction

    Reduce absolute value of arrival time Reduce incertainty on arrival time

    Road installationReserved lane, full or only near the junctionCommercial stop after the junctionSeparated road

    SODIT - Beijing - Octobre 2007 6

  • Components of the priority systemDetecting the vehicle

    Local detectionOn-board localisation

    Transmission of this information to the traffic light controllerManagement of the priority demand

    Local decisionCentralised decision

    4 system architectures are possible

    SODIT - Beijing - Octobre 2007 7

  • Local detection / local decisionTraffic controller receives the approach infoAnd compute the new signal plan on its own

    SODIT - Beijing - Octobre 2007 8

  • Local detection / Centralised decision

    PV approach detected by traffic controllerAdapted signal plan computed by a control centreTraffic controller receives new decision from CC

    SODIT - Beijing - Octobre 2007 9

  • On-board localisation / Local decision

    The vehicle is localised by a control centreThe traffic controller manages locally the priority demand

    SODIT - Beijing - Octobre 2007 10

  • On-board localisation / Central decision

    The vehicle is localised by a control centreWhich transmits the info to a Traffic Control Centre The TCC sends priority orders to the local controller

    SODIT - Beijing - Octobre 2007 11

  • Comparaison des Architectures

    Dialogue TC Contrleur de carrefour feux Connexion un PC-Trafic pas ncessaire Avantages : - Suivi prcis de la progression du TC dans la circulation - Systme paramtrable souhait - Systme volutif

    Inconvnients : - Localisation prcise des TC ncessaire - Fiabilit de la chane dinformation

    Domaine demploi privilgi : - Bus voluant dans la circulation gnrale

    Dialogue PC SAE PC Circulation Avantages : - TC utiliss comme capteurs par le PC circulation

    Inconvnients : - Repose sur larchitecture de communication du PC SAE

    ainsi que du PC Circulation - Repose sur les performances du PC Circulation

    Domaine demploi privilgi : - Gestion globale des dplacements : information TC

    utilis pour la rgulation du trafic, rglage des feux adapts au modifications ditinraires

    ACTION LOCALE Avantages : - Robustesse du Systme - Prcision de la dtection - Fiabilit de la chane dinformation

    Inconvnients : - Paramtrage du Systme - Systme peut volutif

    Domaines demploi privilgis : - TCSP - Carrefours isols

    Connexion un PC-Trafic pas ncessaire Avantages : - Robustesse du Systme - Prcision de la dtection - Fiabilit de la chane dinformation

    Inconvnients : - Paramtrage du Systme - Systme peut volutif

    Domaines demploi privilgis : - TCSP - Carrefours isols

    Contrleur de carrefour feux remonte les informations et obit aux ordres du PC Circulation Avantages : - Matrise de limpact de la priorit des TC sur

    lcoulement des VP Inconvnients : - Repose sur larchitecture de communication du PC

    Circulation - Repose sur les performances du PC Circulation

    Domaines demploi privilgis : - Matrise de la priorit des TC par le PC Circulation

    ACTION CENTRALISEE Avantages : - Robustesse du Systme - Prcision de la dtection - Fiabilit de la chane dinformation

    Inconvnients : - Paramtrage du Systme - Systme peut volutif

    Domaines demploi privilgis : - TCSP - Carrefours isols

    Dt

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    n Lo

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    Lo

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    n em

    barq

    ue

    SODIT - Beijing - Octobre 2007 12

  • PT priority in 5 steps

    SODIT - Beijing - Octobre 2007 13

  • Programming of data exchanges

    Temps

    Point d'arrt

    Zone d'influence du contrleur

    Distance

    Point d'appel n1 n2 n3 Acquittement

    Courbe thorique

    Trafic fluide - Pas darrt

    Trafic dense Avec Arrt

    Influence Zone of the controller

    SODIT - Beijing - Octobre 2007 14

    Several approach Curves

  • Basic Equipments

    SODIT - Beijing - Octobre 2007 15

    Position Heure

    PC SAE TCRA

    Dbut de zone prioritaire

    Fin de zone prioritaire

    PC Circulation Ville dAvignon

    Demande de priorit

    GPS

    Point Haut

    Vehicle positioning

    Priority management at the traffic light

    Communication Vehicle to infrastructure

    Communication of receiver at the controller

    Beginning of the influence zone

    End of the influence zone

    Priority demand

  • Thank you for your attention

    Laurent Breheret

    SODIT France

    breheret@sodit.info

    SODIT - Beijing - Octobre 2007 16

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