15%
20%
25%
75%
Answer is Right!
Answer is Wrong!
The correct answer is A. 15%.
Superelevation is the banking of a road to counteract the centrifugal force experienced by vehicles traveling around a curve. It is designed to keep vehicles from skidding off the road. The amount of superelevation required depends on the speed of the vehicles and the radius of the curve.
For mixed traffic conditions, the speed is reduced by 15% to account for the fact that there will be a mix of vehicles traveling at different speeds. This reduces the centrifugal force experienced by the vehicles and allows for a smaller amount of superelevation to be used.
Option B is incorrect because it is too high. Option C is incorrect because it is too low. Option D is incorrect because it is much too high.