Practice Quiz

Civil Engineering PE

Category - Transportation

Start a Study Session Sign up for Question of the Day
The approximate location of the low point of a 400 ft sag vertical curve is at which of the following stations? Assume g1 = -3.2%, g2 = 1.8%, PVI is located at Sta 100+00.
  1. Sta 95+44
  2. Sta 98+00
  3. Sta 100+56
  4. None of the above
Explanation
Answer: C - The station of the low point is approximately 100+56.

Solution: Use the sag vertical curve formula

X = -g1 / r = -g1L / (g2 - g1)

Where L = 400.00 ft = 4 Sta

g1 = -3.2

g2 = 1.8

X = - (-3.2)(4) / (1.8)-(-3.2) = 2.56 Sta

Low point location is 256 feet from beginning of the vertical curve

= [(100+00.00)-(2+00.00)] + (2+56.00) = 100+56.00
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