Practice Quiz

Civil Engineering PE

Category - Transportation

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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.
  1. 333 feet
  2. 600 feet
  3. 1,001 feet
  4. Not enough information provided
Explanation
Answer: C - 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
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