If an ascending gradient of 1 in 50 meets a descending gradient of 1 in 50, the length of summit curve for a stopping sight distance of 80 m will be A. zero B. 64m C. 80m D. 60m

The correct answer is B. 64m.

The length of a summit curve is calculated using the following formula:

$L = \frac{S_{sd}}{0.085} \sqrt{\frac{v^2}{g}}$

where:

• $L$ is the length of the summit curve in meters
• $S_{sd}$ is the stopping sight distance in meters
• $v$ is the design speed in kilometers per hour
• $g$ is the acceleration due to gravity in meters per second squared

For a stopping sight distance of 80 m, a design speed of 80 km/h, and

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