Bus Actuated Signal Preemption Systems: A Planning Methodology,

摘要

Although bus preemption systems have been tested and proven feasible,no generalizations have been drawn from these experiments which have prevented planners from applying this innovation to their particular problems or geographic locations with any assurance it would be economically desirable. The overall purpose of the study is to generalize the results of previous research,experimentation,and demonstration and to derive design guides and warrants for the installation of bus actuated signal preemption equipment. In particular,this report examines the conditions under which a green extension signal preemption can be operated. Equations were constructed which describe its behavior in terms of costs and revenues generated to the bus,its passengers,and other traffic. These equations are then used to compute a revenue-cost ratio which may be used for evaluating the economic desirability of installing this type of preemption system at a particular intersection. The methodology points out the potential of bus actuated signal preemption systems and also identifies areas needing further research.