Practice Quiz

Civil Engineering PE

Category - Transportation

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Which of the following is most nearly the stopping site distance for a speed of 60 kilometers per hour (km/h) on a flat grade roadway?
  1. 65 meters
  2. 85 meters
  3. 90 meters
  4. 220 meters
Explanation
Answer: B - The stopping sight distance (SSD) for a speed of 60 km/h on a flat grade roadway is most nearly 85 meters.

Solution: Use the SSD equation for flat grade (Metric units)

d = 0.278Vt + 0.039 V2/a

Where, t = 2.5 seconds

a = 3.4/second2

V = 60 km/h

d = 0.278 (60) (2.5) + 0.039 (60)2/ (3.4)

= 41.7 + 41.3

= 83.0 meters -->round to 85 meters
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