Vihdintie roundabout is a five-arm conventional roundabout with some 140 m in diameter. It is located in a western suburban area in Helsinki and it connects three important main roads together. A theoretical five-arm roundabout signalling model was studied with Transyt. Only the offsets and splits were optimised. A cycle time of 60 seconds was chosen because of analytical considerations. The size of the roundabout was chosen so that the travel time round the system was assumed to be 40 seconds. The study shows that the optimisation of timings with Transyt is very useful, especially the possibility of handling all traffic streams separately with the shared stopline-option. Traffic actuated control mode is suitable for roundabout signalling. Some special control logic should be used, which maintains the good progression of vehicles through adjacent stoplines.


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    Title :

    Vihdintie roundabout-new approach in high-performance signal control


    Additional title:

    Der Vihdintie-Kreisverkehr - ein neues Verfahren für leistungsfähige Signaltechnik


    Contributors:
    Sane, K.J. (author)


    Publication date :

    1990


    Size :

    5 Seiten, 4 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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