Simulation of an unconditional pre-emption bus priority system. Paper presented at the 54th Annual Meeting of the Transportation Research Board, Washington, January 1975.

It is discussed how an urban network traffic model had been modified to simulate an unconditional pre-emption bus priority technique that automatically grants a green signal to buses approaching an intersection. An improvement of 15 to 20% in bus travel time is possible, but there would be some adverse effect on cross-street traffic. For headways that are greater than two min far-side bus stops appear to be best.