What type of road conditions does the AASHTO Green Book mostly address in terms of visibility?

• A. Urban roadways
• B. Rural highways
• C. Interstate highways
• D. All road types

Answer: (D)

The AASHTO Green Book, formally known as "A Policy on Geometric Design of Highways and Streets," addresses the principles of roadway design, including visibility considerations, across all types of roadways. It emphasizes the importance of adequate sight distance, clear zones, and other geometric features that enhance driver visibility and safety.

The visibility needs can vary significantly depending on the type of roadway; however, the standards and guidelines provided in the Green Book are applicable universally, whether for urban roadways, rural highways, or interstates. All road types have specific visibility requirements influenced by factors such as traffic speed, road curvature, and environmental characteristics. The comprehensive guidance in the Green Book ensures that visibility is adequately addressed in any roadway design, reinforcing that safe travel conditions are critical in urban settings, rural areas, and along interstate routes. This holistic approach is essential for creating a safe transportation environment for all road users.