Types of Road Curves

1. 

2. 
❖

3. 

4. 
Provides a transition
between two
tangent lengths of
roadway. (Point
of Curvature at
beginning of curve)
(Point of
Intersection of
tangents) (Point
of Tangency at end
of curve).

5. 
• Necessary for gradual change in
direction when a direct point of
intersection is not feasible Ex.
Highways, Interstates,
high speed roads
with constant flow
of traffic.

6. 
1) Simple Circular
2) Compound
3) Reverse
4) Transition

7. 
• When a curve
consists of a single
arc with a constant
radius connecting
the two tangents it is
said to be a

8. 
• When a curve
consists of two or
more arcs with
different radius, it is
called a

9. 
• A consists of two
arc bending in opposite
directions. Their centers lie on
opposite sides of the
curve. Their radius
may be either equal
or different.

10. 
• A curve of variable radius is
known as a . It is
also called a or
. In railways, such
a curve is provided
on both Sides of a
Circular curve to
Minimize super
elevation.

11. 
➢ For the gradual introduction
➢ To introduce gradually
➢ To introduce widening gradually
➢ To provide comfort for the that
is to enable operation
on
➢ To enhance aesthetics of

12. 
The following conditions should be fulfilled
while providing a transition curve

13. 

14. 

15. 
• To overcome this force and for
safe travel of a vehicle, the outer
edge of the road is
above the inner edge.
This is known as
or
.

16. 
is provided to
achieve the higher speed of
vehicles. It increases the stability
of fast-moving vehicles when they
pass through a horizontal curve,
and it also decreases
the stresses on the
foundation.