Which publication provides information on stopping sight distance and passing sight distance?

• A. AASHTO Green Book
• B. FHWA Manual
• C. ISTA Guidelines
• D. ITE Recommended Practices

Answer: (A)

The AASHTO Green Book, formally known as the "A Policy on Geometric Design of Highways and Streets," is a key resource for transportation engineers. This publication provides comprehensive guidelines on various geometric design elements, including stopping sight distance and passing sight distance.

Stopping sight distance is the minimum sight distance required for a driver to see an object in the road ahead and come to a stop safely. Passing sight distance refers to the distance required for a driver to safely pass another vehicle on a two-lane road, ensuring that there is enough clear sight distance to complete the maneuver without endangering oneself or other vehicles.

This information is crucial for designing safe roadways and ensuring that they accommodate traffic flow effectively. The AASHTO Green Book serves as a standard reference for these critical measurements, helping engineers make informed decisions about road design and safety. Other publications mentioned may provide guidance on different aspects of roadway design, traffic engineering, or specific standards, but the AASHTO Green Book is recognized for its detailed coverage of geometric elements like sight distance, making it the correct choice in this instance.