ANALYSIS OF THE PROPOSED USE OF DELAY-BASED LEVELS OF SERVICE AT SIGNALIZED INTERSECTIONS

Stopped delay calculations were made for many combinations of cycle length, ratio of effective green time to cycle length (g/C ratio), and quality of signal progression, to aid in the following: identifying the relationships between computed delay and volume-to-capacity (v/c) ratio for lane groups at signalized intersections; determining how to solve for v/c ratio and service flow rate when the desired level-of-service (LOS) delay value is known; examining methods for using the delay-based LOSs in intersection design, both geometrics and signal timing. Sensitivity analyses reveal that many combinations of long cycle lengths, low g/C ratios, and adverse progression result in such high delays that LOS levels of A, B, and C are unattainable, even at low v/c ratios. Computer-generated tabulations are proposed to aid in solving for v/c ratios and maximum flow rates associated with desired delay-based LOSs.