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.
A headway safety policy for automated highway operations
Abstandsicherheitsueberlegungen fuer automatisierten Autobahnbetrieb
IEEE Transactions on Vehicular Technology ; 28 , 1 ; 22-28
1979
7 Seiten, 6 Bilder, 3 Tabellen, 10 Quellen
Article (Journal)
English
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