This document discusses signal retiming, which is the process of optimizing traffic signal timing parameters like cycle length, offset, and split times. Signal retiming can reduce delays, stops, fuel consumption, and accidents at intersections. It is conducted by collecting traffic data and analyzing it using software to determine improved signal timing plans. Signal retiming should be conducted every 1-3 years to account for changing traffic patterns and is estimated to cost $2,500 per intersection. Studies show signal retiming can reduce delays by 15-30% and lower fuel consumption and emissions.