When calculating vertical clearance, which points are crucial to consider?

• A. High and Low points on the vertical curve
• B. Begin and End of the roadway
• C. Maximum and Minimum speeds
• D. Entrance and Exit ramps

Answer: (A)

Calculating vertical clearance is critical in transportation engineering to ensure that vehicles can pass safely under structures such as bridges and overpasses. When determining vertical clearance, the high and low points on the vertical curve are particularly crucial because they establish the maximum and minimum elevation of the road profile in relation to the structure above.

The high point dictates the lowest clearance available to vehicles traveling along the curve, while the low point provides insight into the maximum height that could be allowed for safe navigation under the structure. This information is fundamental in defining the appropriate design criteria for both the roadway and the overhead elements, ensuring that all vehicles, including large trucks, can pass without risk of collision.

Collectively, considering these points helps to create a safe and efficient roadway environment, meeting the required standards for height clearances established by relevant design guidelines and regulations.