What is the assumed height of an object above the pavement as per AASHTO?

• A. 1 ft
• B. 2 ft
• C. 3 ft
• D. 4 ft

Answer: (B)

The assumed height of an object above the pavement as per AASHTO is commonly set at 2 feet. This standard is used in various transportation design contexts, including the assessment of clear zones, sight distances, and obstacle height considerations in road design and safety evaluations.

By establishing this 2-foot height standard, designers and engineers can ensure that there is sufficient clearance for vehicles and that any potential obstacles do not obstruct the visibility of important road features. This height is also beneficial in evaluating the adequacy of roadside safety features and the impact of objects on the roadway environment. Such uniformity provides a consistent basis for engineering calculations and safety assessments across different projects.