Which book contains information on superelevation and ramps?

• A. AASHTO Green Book
• B. AASHTO Blue Book
• C. Highways and Transportation Manual
• D. Traffic Engineering Handbook

Answer: (A)

The AASHTO Green Book, officially known as the "AASHTO Policy on Geometric Design of Highways and Streets," is the primary reference for highway design and includes detailed guidance on various geometric design elements, including superelevation and ramp design. Superelevation refers to the banking of a roadway at a curve, which is essential for counteracting the effects of lateral acceleration on vehicles, thereby enhancing safety and comfort.

The Green Book provides specific design criteria, guidelines, and best practices related to superelevation, including the recommended rates of superelevation for different types of roads and conditions, as well as considerations for designing ramps that facilitate smooth transitions and safe maneuvering for vehicles. This resource serves as the foundational guide for transportation engineers and planners when designing roadway geometry to ensure it meets safety and operational standards.

While the other books mentioned also contain relevant information for transportation and roadway design, they are not primarily focused on geometric design principles to the extent found in the AASHTO Green Book. The AASHTO Blue Book discusses geometric design but is mainly focused on the design of public roads in relation to traffic control devices and their placement. The Highways and Transportation Manual may address broader transportation planning issues, but it does not provide