Where would you find information regarding roundabouts in the context of traffic engineering?

• A. Highway Capacity Manual, Chapter 20
• B. Highway Capacity Manual, Chapter 22
• C. Traffic Control Devices Handbook, Chapter 10
• D. Urban Transportation Planning, Chapter 5

Answer: (B)

The appropriate reference for information on roundabouts in traffic engineering is found in the Highway Capacity Manual, specifically in Chapter 22. This chapter provides a comprehensive understanding of the capacity and operational analysis related to roundabouts, addressing key factors like entry and circulatory roadway characteristics, traffic flow, and performance measures.

A thorough understanding of the material in Chapter 22 helps practitioners design and evaluate roundabouts. It includes methodologies for assessing their effectiveness in improving safety and reducing delays compared to traditional intersections. This focus on capacity and performance analysis aligns perfectly with the needs of traffic engineers working to optimize roadway systems and ensure efficient traffic management.

In contrast, other resources mentioned may not cover roundabouts in the same detail or context relevant to operational capacity. While the Highway Capacity Manual contains broader traffic analysis guidelines, specific aspects of roundabout dynamics are uniquely explored in Chapter 22, making it the most suitable source for this topic.