According to guidelines, how high above the pavement is the driver's eye for large trucks assumed to be?

• A. 6.0 ft
• B. 7.6 ft
• C. 8.5 ft
• D. 9.0 ft

Answer: (B)

The driver's eye height for large trucks is assumed to be 7.6 feet above the pavement, which is the correct answer. This value is established to ensure consistency in design and safety assessments for roadway features. Knowing the driver's eye level helps engineers design effective sight lines, signage, and other critical features that aid in safe navigation and operation of large trucks on roadways.

This height takes into account the typical cab height of large trucks and reflects a balance between reality and the need for effective roadway design that caters to the specific characteristics of larger vehicles. Accurate eye height measurements are essential for ensuring that drivers have adequate visibility of the roadway and surrounding environment, particularly at intersections, on ramps, and under overpasses.

By using this standard height, transportation engineers can better predict and design for how trucks will interact with roadway elements, thereby enhancing overall safety for all road users.