12.2.4.3 Queue Length

Queue length is the number of vehicles waiting to proceed through the roundabout due to congestion. Queue length is typically reported as the 95th percentile queue length and is reported in feet. Queue length is calculated with formulas found in the HCM and is dependent on V/C ratio, capacity, and analysis time period. Queue may be used:

When calibrating simulation models;

To determine adequate vehicular storage length based on queue length;