This document discusses traffic signal priority (TSP) techniques that can provide priority to public transportation services through traffic lights. It aims to improve the performance of public transit systems by reducing travel times and improving reliability. TSP can complement features of bus rapid transit systems. The document outlines different types of priority that can be provided, as well as actions that can be taken at traffic signals like extending green lights or allowing early starts in response to detected transit vehicles. It also lists various data sources that can be used to evaluate TSP, such as automatic vehicle location records and signal timing plans.