What section in the AASHTO Green Book discusses information on the maximum recommended superelevation rates?

• A. Sec. 3.3.3.2
• B. Sec. 3.3.3.1
• C. Sec. 3.3.4
• D. Sec. 3.3.5

Answer: (A)

The section in the AASHTO Green Book that discusses information on maximum recommended superelevation rates provides critical guidance for roadway design, particularly in areas where horizontal curves are present. Superelevation refers to the banking of a roadway curve to counteract the effects of lateral acceleration and enhance vehicle stability while navigating a curve.

Section 3.3.3.2 specifically addresses the superelevation rates and outlines the methodologies for determining appropriate values based on design speed and other factors. It includes criteria that help engineers achieve optimal safety and performance standards. The maximum recommended rates are crucial because they inform the designer about how much to bank a curve to minimize the risk of vehicle skidding off a roadway or overturning during a turn.

Understanding this section is essential for civil engineers as they must incorporate these recommendations into their designs to create safe and efficient transportation systems.