American Institute of Certified Planners (AICP) Practice Exam

What Level of Service is characterized by relatively free flow of traffic with little or no limitation on movement?

1. Level of Service A

2. Level of Service B

3. Level of Service C

4. Level of Service D

The correct answer is: Level of Service A

Level of Service A is characterized by a relatively free flow of traffic, where vehicles can move without significant restrictions. This level indicates an ideal condition where traffic density is low, allowing for smooth, unobstructed travel at or near the maximum speed limit. Under Level of Service A, drivers experience minimal delays, and the road system operates efficiently. This level typically reflects a situation where there are few interactions between vehicles, such as merging, lane changes, or traffic signals, facilitating a seamless journey. Other levels of service indicate varying degrees of congestion and limitations on movement, with B starting to show slight restrictions, C indicating stable flow but with the potential for increased delays, and D signifying significant traffic congestion where movement becomes considerably restricted. Level of Service A stands as the benchmark for optimal traffic conditions.