American Institute of Certified Planners (AICP) Practice Exam

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A Level of Service (LOS) of "C" at a signalized intersection means?

  1. Uncongested operations.

  2. Significant congestion.

  3. Light congestion, occasional backups on critical approaches with an average delay of 15-20 seconds.

  4. Severe congestion with delays over 30 seconds.

The correct answer is: Light congestion, occasional backups on critical approaches with an average delay of 15-20 seconds.

A Level of Service (LOS) rating is an important indicator of traffic operation efficiency at intersections and other transport facilities. A LOS of "C" signifies that there is light congestion and occasional backups, especially on critical approaches to the intersection. Specifically, at this level, drivers can expect an average delay of about 15 to 20 seconds, which implies that while traffic may flow fairly well, there are moments when congestion is noticeable and can cause delays. This description accurately reflects the conditions commonly associated with LOS "C," where operations are still generally adequate but might require increased attention due to the potential for delays. Understanding this level helps in anticipating delays and congestion while planning for traffic management at signalized intersections.