Camber shape effect: On a pavement with a parabolic camber, how does the angle of inclination (cross slope) of vehicles vary from the crown to the edges?

Introduction / Context:
Camber (cross fall) shapes the transverse slope of a road to drain water. A popular shape is a true (quadratic) parabolic camber, which avoids abrupt slope changes and improves riding comfort compared to a straight-line (plane) camber.

Given Data / Assumptions:

• Parabolic camber profile across the carriageway.
• Angle of inclination refers to the local cross slope at a given offset from the crown.

Concept / Approach:

In a parabolic camber, the slope is zero at the crown and increases with distance from the centerline, reaching its maximum at the pavement edges. This yields gentle near-crown slopes to enhance comfort and larger edge slopes to provide drainage capacity.

Step-by-Step Reasoning:

Verification / Alternative check:

Camber tables show edge slopes equal to the specified camber percentage, while slope at the crown is effectively zero for a parabolic form.

Why Other Options Are Wrong:

• “More at the crown” or “Less at the edges” contradict the mathematics of a parabola.
• “Same at edges and crown” applies to plane camber, not parabolic.

Common Pitfalls:

• Assuming a uniform cross slope for all camber shapes; only straight-line camber has constant slope.

Final Answer:

More at the edges.