Which chapter of the AASHTO guide discusses superelevation?

• A. Chapter 1
• B. Chapter 2
• C. Chapter 3
• D. Chapter 4

Answer: (C)

The AASHTO guide addresses superelevation in Chapter 3, which focuses on geometric design parameters essential for creating safe and efficient roadways. Superelevation refers to the banking of a roadway at a curve, where the outer edge of the pavement is raised relative to the inner edge. This design element is crucial for helping vehicles maintain stability while maneuvering through curves by counteracting the effects of centrifugal force. It provides guidelines on how to determine the appropriate superelevation rate based on factors like design speed, curve radius, and other relevant conditions. Understanding superelevation is vital for traffic safety and vehicle dynamics, making Chapter 3 an essential resource for transportation engineers.

The other chapters cover different aspects of road design, so they do not specifically focus on the topic of superelevation as it is primarily treated in Chapter 3.