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The chapter covers essential principles of horizontal alignment, focusing on the design and implementation of superelevation in roadway engineering. It highlights guidelines and formulas for ensuring road safety for various types of vehicles while navigating curves, along with concepts of mechanical and psychological roadway widening. The discussion emphasizes the importance of considering both design speed and lateral friction in determining appropriate superelevation and curve radius.
Chapter 1512 sections
The chapter covers essential principles of horizontal alignment, focusing on the design and implementation of superelevation in roadway engineering. It highlights guidelines and formulas for ensuring road safety for various types of vehicles while navigating curves, along with concepts of mechanical and psychological roadway widening. The discussion emphasizes the importance of considering both design speed and lateral friction in determining appropriate superelevation and curve radius.
Superelevation is crucial for road safety, particularly in curves, requiring careful design based on vehicle types and speeds.
IRC guidelines establish maximum and minimum values for superelevation depending on terrain and vehicle dynamics.
Extra widening is necessary at curves to accommodate both mechanical and psychological factors affecting vehicle movement.
The banking of a roadway at a curve, designed to counteract the effects of centrifugal force, enhancing vehicle stability.
The increase in roadway width required due to the off-tracking of vehicles negotiating a curve.
The additional width provided on curves to give drivers a sense of extra space and security.
The distance from the center of a circular curve to its outer edge, which affects speed and safety on curves.
Total Questions
2
Estimated Time
4 min
Passing Score
70%
1 more question available