What is the recommended length of a vertical curve to provide a stopping sight distance of 600 feet on a roadway where the ascending grade is +4% and the descending grade is -2%? Assume that S

Question

What is the recommended length of a vertical curve to provide a stopping sight distance of 600 feet on a roadway where the ascending grade is +4% and the descending grade is -2%? Assume that S < L; eye height is 3.5 feet; object height is 2.0 feet.

Quizplus · Accepted Answer

The length of the vertical curve to provide a stopping sight distance (SSD) for a roadway of 600 feet on a roadway where the ascending grade is +4% and the descending grade is -2% is 1,001 feet.
Solution: Use the SSD on crest curve equation (US Customary units)
L = AS2/2158
Where, A = 6%
S = 600 feet
L = 6(600)2/2158
= 1,001 feet

What Is the Recommended Length of a Vertical Curve to Provide