Question

Overturning of vehicles on a curve can be avoided by using a:

• A. compound curve
• B. vertical curve
• C. reverse curve
• D. transition curve

Hint:

Transition curves help ensure gradual change in curvature, reducing overturning risk.

Answer 1

The Correct Option is D

To ensure the safe navigation of vehicles on curves, especially at high speeds, a transition curve is essential. A transition curve gradually introduces the centrifugal force experienced by a vehicle when it enters a circular path from a straight path, thus reducing the risk of overturning. Here's a breakdown of why a transition curve is important:

1. Centrifugal Force Management: When a vehicle travels along a curve, it experiences a centrifugal force pushing it outward. A sudden application of this force (as at the beginning of a curve) can lead to instability and increase the risk of overturning.
2. Gradual Change in Curvature: Transition curves are designed to provide a gradual change from the tangent (straight path) to the circular curve. This allows vehicles to adjust their speed and direction smoothly, accommodating any changes in force felt by the vehicle and its passengers.
3. Improved Safety: By designing a curve with a gradual transition, the hazard of quick shifts in direction, which could destabilize the vehicle, is reduced. This keeps the vehicle safely on its track.
4. Comfort: Not only does it ensure safety, but a transition curve also enhances passenger comfort by reducing jolts and lateral acceleration, providing a more pleasant ride.

Overall, utilizing a transition curve is crucial in maintaining the stability and safety of a vehicle navigating a curve, preventing overturning and improving the overall driving experience.