Multiple choice

Consider the following statements in the context of geometric design of roads. I: A simple parabolic curve is an acceptable shape for summit curves. II: Comfort to passengers is an important consideration in the design of summit curves. The correct option evaluating the above statements and their relationship is

  1. I is true, II is false

  2. I is true, II is true and II is the correct reason for I

  3. I is true, II is true and II is NOT the correct reason for I

  4. I is false, II is true
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A simple parabolic curve is indeed the standard shape for summit curves because it provides a constant rate of change of grade. However, comfort is not the primary consideration for summit curves (it is for sag curves); the primary consideration for summit curves is sight distance.

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