Question

Transition curves are introduced at each end of a circular curve to obtain:

• A. gradual decrease of curvature from zero at the tangent point to a specified quantity at the junction of the transition curve with the main curve
• B. gradual increase of super elevation from zero at the tangent point to a specified amount at the junction of the transition curve with the main curve
• C. gradual change of gradient from zero at the tangent point to a specified amount at the junction of the transition curve with the main curve
• D. gradual change of gradient from 1 in 6 at the tangent point to a specified amount at the junction of the transition curve with the main curve

Hint:

Transition curves gradually raise super elevation at curve entry points.

Answer 1

The Correct Option is B

Transition curves are essential components in railway and road design, ensuring a smooth and safe change from straight paths to curved paths. There are several reasons for their implementation, primarily focusing on the change in curvature and super elevation. Here's a detailed breakdown:

Reason for Transition Curves: Transition curves facilitate a gradual increase of super elevation from zero to a designated amount. This is crucial in the design of roads and railways to provide stability and comfort for vehicles and trains navigating the curves. The correct choice from the options provided is: "gradual increase of super elevation from zero at the tangent point to a specified amount at the junction of the transition curve with the main curve."

This ensures the outward force experienced by the vehicles is counteracted effectively, helping in maintaining control and reducing the risk of accidents. The introduction of the curve starts at the tangent point where the curvature is zero (straight path), smoothly transitioning into the full curvature of the main circular curve.

Key Factors:

• Gradual Increase of Super Elevation: This is the tilting of the road or track to counteract the lateral acceleration experienced by vehicles, helping them to maintain traction.

Understanding the role of transition curves is fundamental in Geo Engineering and Geo Informatics as they contribute significantly to the efficiency and safety of transport systems.