Where can you find information regarding sight distance for railroad crossings?

• A. AASHTO Green Book
• B. Highway Capacity Manual
• C. Traffic Engineering Handbook
• D. Road Safety Guidelines

Answer: (A)

The AASHTO Green Book, formally known as the "A Policy on Geometric Design of Highways and Streets," provides comprehensive guidelines and standards related to highway geometric design, including the critical aspects of sight distance at various roadway features such as intersections and railroad crossings. Sight distance is an essential factor for safety at railroad crossings, as it determines the distance a driver must be able to see to make an informed decision about whether it is safe to cross the tracks.

The Green Book discusses the criteria for evaluating sight distances and outlines the necessary measurements and design considerations that must be accounted for to ensure the safety of motorists at these crossings. This resource is widely utilized by civil engineers and transportation planners to meet safety standards in highway design, making it the most appropriate reference for this specific information.

In contrast, the Highway Capacity Manual focuses primarily on traffic flow and capacity analysis rather than geometric design. The Traffic Engineering Handbook provides general principles of traffic engineering but does not specifically address sight distance requirements for railroad crossings. The Road Safety Guidelines may cover broader safety issues but lacks the specific design details found in the AASHTO Green Book. Thus, for accurate and reliable information on sight distance at railroad crossings, the AASHTO Green Book is the definitive source