Which section of the AASHTO Green Book provides information on passing sight distance (PSD)?

• A. Sec. 3.2.2.3
• B. Sec. 3.2.4
• C. Sec. 5.1.4.3
• D. Sec. 9.6.4

Answer: (B)

The section of the AASHTO Green Book that provides information on passing sight distance (PSD) is found in Section 3.2.4. This section is specifically focused on the parameters that influence sight distances, including stopping sight distance as well as passing sight distance.

Passing sight distance is a critical design element for highways, as it ensures that drivers have adequate visibility to safely overtake slower-moving vehicles. This section lays out the required minimum distances based on factors such as the speed of the roadway and the characteristics of the vehicles using it, which are essential for ensuring safety and efficiency in road design.

Understanding these guidelines is crucial for engineers involved in roadway design, as it helps to prevent accidents that could occur from inadequate sight distances when passing. The inclusion of these details reflects the importance of calibrated sight distances in promoting safe driving conditions.