What is the purpose of superelevation on a road?

Superelevation refers to the banking of a roadway at a curve, where the roadway is tilted towards the outside edge. This design is significant as it helps vehicles maintain stability while navigating curves. By banking the road, the forces acting on a vehicle, such as centrifugal force, are countered, reducing the risk of skidding or losing control. In essence, superelevation aids in safely directing vehicles around curves, promoting smoother and safer turns. This is especially important in emergency response scenarios, where timely and safe maneuvering can be critical.

The other options present roles that aren't directly associated with the concept of superelevation. While enhancing traction during rainy conditions and reducing wear on road surfaces may contribute to overall road safety and maintenance, they do not specifically relate to the banking effect of the roadway. Additionally, speed limits are communicated through signage, rather than through any physical roadway design element such as superelevation. Thus, option B accurately reflects the intended purpose of superelevation in road design.