Which one of the following is an advantage for providing the transition curve on a road?
- AIt allows a sudden transition of curvature from the tangent to the circular curve.
- BThe radius of curvature increases suddenly
- CIt is provided for the sudden change in superelevation
- DIt eliminates the danger of derailment, overturning or slide-slipping of vehicles and discomfort to passengersCorrect
Solution
Concept
Purpose of transition curves
Step-by-step solution
1. A transition curve gives a gradual change of curvature and superelevation. 2. It removes sudden centrifugal effects, improving safety and comfort.
Explanation
The gradual change in curvature and cant means vehicles do not experience a sudden jerk that could cause overturning, slipping or discomfort.
Why the other options are wrong
The other statements describe sudden changes, which a transition curve is designed to avoid.
Shortcut
Transition = gradual.
Common mistake
Choosing a "sudden" statement.
Correct answer: D) It eliminates the danger of derailment, overturning or slide-slipping of vehicles and discomfort to passengers