The maximum capacity, cost, and safety of an automated highway system are largely dependent on the selected headway policy, i.e., the specification of a minimum acceptable headway (as a function of speed) for mainline operations. Here a policy, designed to avert collisions due to 'reasonable' lead-car deceleration, is presented and evaluated in the context of achieving high capacity (equal 3600 vehicle/lane/hr) over a range of typical highwy speeds -13.5 to 30 m/s (30.2 to 67.2 mi/h). This involved a detailed analysis to determine both the realtionships between, and the requirements on, the seven parameters which are embedded in this policy. These pertain to systems-level operations, the capabilities of a vehicle's automatic control system, and the vehicle/roadway interface. The trade-offs associated with safety, capacity, and cost (in the form of required future development efforts) are identified, and three general approaches to selecting parameters for an operational system are specified.


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    Title :

    A headway safety policy for automated highway operations


    Additional title:

    Abstandsicherheitsueberlegungen fuer automatisierten Autobahnbetrieb


    Contributors:
    Fenton, R. (author)

    Published in:

    Publication date :

    1979


    Size :

    7 Seiten, 6 Bilder, 3 Tabellen, 10 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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