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Along Horizontal curves, if centrifugal force exceeds lateral friction, vehicle may
Skid
not be affected
slip
none of these
Skid
When a vehicle moves along a horizontal curve, it experiences a centrifugal force acting outward. If this force is not balanced by the side friction (lateral friction) between the tires and the road, the vehicle loses its lateral stability and skids outwards.
When a vehicle moves along a horizontal curve, it experiences a centrifugal force acting outward. If this force is not balanced by the side friction (lateral friction) between the tires and the road, the vehicle loses its lateral stability and skids outwards.
P=gRWv2тАЛ тАФ Centrifugal force where P is the force, W is weight, v is velocity, and R is radius.
f=WPтАЛ=gRv2тАЛ тАФ Lateral friction coefficient required for equilibrium.
The condition for stability on a horizontal curve is governed by the equilibrium between the outward centrifugal force P and the inward resistive forces, namely the lateral friction F. The centrifugal ratio is defined as P/W=v2/gR. Skidding occurs when the lateral friction coefficient f is exceeded by the lateral force coefficient, i.e., f<gRv2тАЛ.
Skidding occurs when the vehicle slides sideways because the lateral friction is insufficient.
The maximum permissible value of the coefficient of lateral friction is 0.15 as per IRC guidelines.
Superelevation is provided on curves to counteract the centrifugal force and prevent skidding.
If the vehicle velocity increases beyond the design speed, the risk of skidding increases significantly.
Provides a safety margin for road design.
Helps in calculating the safe transition curve length.
High lateral friction leads to rapid tire wear.
Excessive lateral force can cause discomfort to passengers.
Highway geometric design.
Traffic safety engineering and curve banking design.
Slip is typically associated with the rotation of wheels (e.g., spinning wheels) rather than the lateral displacement of the vehicle body on a curve.
If centrifugal force exceeds both friction and superelevation, the vehicle may overturn (if the center of gravity is high) or skid (if the friction is low).
A is correct тАФ Skidding occurs when the lateral force exerted on the vehicle exceeds the available resistive lateral friction force between the tires and the road surface.
Always remember that 'Skidding' refers to lateral movement (sideways) while 'Slipping' refers to longitudinal movement (rotation without movement) in transportation engineering terminology.