Which table in the AASHTO Green Book contains information about roundabouts?

• A. Table 8-4
• B. Table 9-3
• C. Table 10-1
• D. Table 7-5

Answer: (B)

The correct choice for identifying the table in the AASHTO Green Book that contains information about roundabouts is indeed associated with traffic operations and design. Table 9-3 specifically addresses roundabouts by providing guidelines on their design and operational characteristics, including values regarding capacity, entry width, and the design speed for roundabouts. This information is crucial for engineers when designing safe and efficient roundabouts, as these features significantly influence the flow of traffic and overall safety at intersections.

The other tables mentioned focus on different aspects of road design. For example, Table 8-4 is typically concerned with roadway design criteria, while Table 10-1 includes information on horizontal and vertical alignments. Table 7-5 usually pertains to specific geometric design criteria for various road types. Understanding the purpose of these tables allows for better navigation of the content within the AASHTO Green Book, ensuring that the right design standards and guidelines are referenced when working on specific roadway design issues like roundabouts.