Question

Which of the following parameters are required for the design of a transition curve for a highway system? 

(A) Rate of change of grade 
(B) Rate of change of radial acceleration 
(C) Rate of change of super elevation 
(D) Rate of change of curvature 
Choose the most appropriate answer from the options given below:

• A. A, B and C only
• B. A, B and D only
• C. A, C and D only
• D. B, C and D only

Hint:

Transition curves are provided to ensure comfort and safety by controlling radial acceleration, curvature, and superelevation changes.

Answer 1

The Correct Option is D

Step 1: Transition Curve Design Criteria. Transition curves in highways facilitate a smooth progression in curvature and superelevation. Essential parameters include: - Rate of change of radial acceleration. - Rate of change of superelevation. - Rate of change of curvature.

Step 2: Exclude Non-Essential Parameter. The rate of change of grade (longitudinal slope) does not influence transition curve design.

Step 3: Final Determination. Consequently, the necessary parameters are (B), (C), and (D). The correct option is (D).