What is queue length?

What is queue length?

• A. The number of pedestrians crossing
• B. The maximum speed along the corridor
• C. The number of vehicles waiting in a queue during red; used for design and safety assessment
• D. The length of bike lanes

Answer: (C)

Queue length is how long the line of vehicles grows while a signal is red. It can be counted as the number of vehicles in the queue or the physical distance the line occupies. This metric is used in design and safety assessment to ensure there’s enough storage at the approach, prevent spillback into other movements, and inform signal timing and intersection design. The described definition matches this idea: the number of vehicles waiting in a queue during red, used for design and safety assessment. It’s not about pedestrians crossing, speed along the corridor, or bike lanes, which are different measures.

Queue length is how long the line of vehicles grows while a signal is red. It can be counted as the number of vehicles in the queue or the physical distance the line occupies. This metric is used in design and safety assessment to ensure there’s enough storage at the approach, prevent spillback into other movements, and inform signal timing and intersection design. The described definition matches this idea: the number of vehicles waiting in a queue during red, used for design and safety assessment. It’s not about pedestrians crossing, speed along the corridor, or bike lanes, which are different measures.