Practice Quiz

Civil Engineering PE

Category - Transportation

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At what distance from the centerline of the inside of a 2-lane highway horizontal curve can a house can be placed without impacting the required stopping distance of 74.1 meters (m) if the radius of the curve is 200 meters and the speed limit is 50 kilometers/hour (km/h)?
  1. 1.75 m
  2. 3.43 m
  3. 175 m
  4. 343 m
Explanation
Answer: B - A house can be placed 3.43 m from the centerline of the inside of a 2-lane highway horizontal curve without impacting the required stopping distance of 74.1 m.

Solution: Use the horizontal curve equation for when S< L (metric units)

m = R (1-cos (28.65S/R)

Where, S = 74.1 m

R = 200 m

m = 200(1-cos [(28.65) (74.1)/200])

= 3.43 m
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