Practice Quiz

Civil Engineering PE

Category - Transportation

Start a Study Session Sign up for Question of the Day
Which of the following is the stopping sight distance (most nearly) for a speed of 70 miles per hour (mph) on a flat grade roadway?
  1. 260 feet
  2. 470 feet
  3. 730 feet
  4. 820 feet
Explanation
Answer: C - The stopping sight distance (SSD) for a speed of 70 mph on a flat grade roadway is most nearly 730 feet.

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

d = 1.47Vt + 1.075 V2/a

Where, t = 2.5 seconds

a = 11.2 feet/second2

V = 70 mph

d = 1.47 (70) (2.5) + 1.075 (70)2/ (11.2)

= 257.3 + 470.3

= 727.6 feet -->round to 730 feet
Was this helpful? Upvote!
Login to contribute your own answer or details
Start a Study Session Sign up for Question of the Day

Top questions

Related questions

Most popular on PracticeQuiz