How do you calculate the superelevation curve?

v = speed in kmph. R = Radius of the curve in metre. ∴ e = 0.201 – 0.15 = 0.051 per meter of carriage way. ∴ Super elevation = 0.051 * 7 = 0.357 m or 35.7 cm above the inner edge of the road.

What is superelevation curve?

Superelevation is the banking of a roadway along a horizontal curve so motorists can safely and comfortably maneuver the curve at reasonable speeds. A steeper superelevation rate is required as speeds increase or horizontal curves become tighter. Definitions.

What is the formula of equilibrium superelevation?

If we provide e = V² / 127R, then the value of ‘f’ will be equal to zero and the lateral friction will not be considered. This superelevation is called equilibrium superelevation.

Why are roads Superelevated around horizontal curves?

The use of superelevation allows a vehicle to travel through a curve more safely and at a higher speed than would otherwise be possible. Side friction developed between the tires and the road surface also acts to counterbalance the outward pull on the vehicle.

What is the minimum radius for road curve?

20 to 130 km/h
(Manns; 1985). (Evren; 2002). Based on the different criterion (Lateral Jerk, lateral acceleration, superelevation), table 1 gives the minimum curve radius from 20 to 130 km/h for highways and table 2 gives the minimum curve radius from 20 to 250 km/h for railways.

What is superelevation short?

1 : the vertical distance between the heights of inner and outer edges of highway pavement or railroad rails.

What is the maximum limit of superelevation?

Maximum and minimum super-elevation IRC specifies a maximum super-elevation of 7 percent for plain and rolling terrain, while that of hilly terrain is 10 percent and urban road is 4 percent. The minimum super elevation is 2-4 percent for drainage purpose, especially for large radius of the horizontal curve.

What is coning of wheel?

The flanges of the wheels of railways are made in the slope of 1 in 20. This is termed as Coning of wheels. The tread of the wheels of a railway vehicle are not made flat, but sloped like a cone in order to enable these vehicles to move smoothly on curves as well as on linear straight track.

What is simple circular curve?

WHAT IS SIMPLE CIRCULAR CURVE?  It is a curve consists of a single arc with a constant radius connecting the two tangents.  It is a type of horizontal curve used most in common.  A simple arc provided in the road or railway track to impose a curve between the two straight lines is the simple circular curve.

What are the types of horizontal curve?


  • Simple. The simple curve is an arc of a circle.
  • Compound. Surveyors often have to use a compound curve because of the terrain.
  • Reverse. A reverse curve consists of two simple curves joined together but curving in opposite directions.
  • Spiral.