American Institute of Certified Planners (AICP) Practice Exam

Roadway delays per vehicle between 15 and 25 seconds would have a level of service of?

1. LOS A

2. LOS C

3. LOS D

4. LOS E

The correct answer is: LOS C

A roadway delay of between 15 and 25 seconds per vehicle typically corresponds to a level of service classified as LOS C. This classification indicates that traffic conditions are stable but beginning to degrade, leading to more noticeable delays. In this context, LOS C suggests that while operations are still acceptable and generally smooth, drivers might begin to experience some discomfort due to increased waiting times. This level reflects conditions where vehicles are more frequently delayed but still moving without significant congestion. By understanding that LOS A represents optimal conditions with minimal delays, and LOS D and LOS E reflect heavier congestion and longer delays, it becomes clear that LOS C encompasses the range of 15 to 25 seconds, indicating a transition from free flow to more congested conditions. Hence, for a delay per vehicle within that range, LOS C is the appropriate designation.