Please enable JavaScript.
Coggle requires JavaScript to display documents.
Vertical Road Curve Design - Coggle Diagram
Vertical Road Curve Design
Needed at intersections of grades or slopes to
provide a gradual change in travelling from one grade line to another.
Crest Curve
Grades meeting at summits
Sag Curve
Grades meeting at valleys
Calculations based on
Algebraic Difference (A) between gradients
Rising Grade (positive)
Descending grade (negative)
Usually a parabola curve
To ensure uniform rate of change of gradients and yield a uniform rate of vertical radial force.
In determining curve length, we need to consider :
Overtaking Sight Distance (For crest curve only)
Stopping Sight Distance
Crest Curves
Sag Curves
Comfort (For Sag Curve only)
Rate of Curvature,K
