The clear distance ahead of vehicle which is visible to the driver is known as sight distance The minimum distance within which a driver can safely stop his vehicle without any collision with some vehicle, animal or any other object is known as stopping sight distance.

1. SARDAR PATEL COLLEGE OF
ENGINEERING,BAKROL

2. HIGHWAY ENGINEERING
(2150601)
GUIDED BY: SHWETA CHAUHAN
SR. NO. NAME ENROLLMENT NO.
1 JIGNESH PRAJAPATI 151240106061
2 MITESH PRAJAPATI 151240106064
3 NILESH PRAJAPATI 151240106065
4 TIRATH PRAJAPATI 151240106066
TOPIC: SIGHT DISTANCE

3.  SIGHT DISTANCE
• The actual distance along the road surface, which
a driver from a specified height above the
carriageway has visibility of stationary or moving
objects, is known as sight distance

4. Types of sight distance
• There are three types of sight distance
• 1. stopping sight distance
• 2. overtaking sight distance
• 3. sight distance at intersection

5. 1. Stopping sight distance
• The minimum sight distance
available on a highway to stop a
vehicle travelling at design speed ,
safely without collision with any
other obstruction is called stopping
sight distance.
Analysis of stopping sight
distance:
The stopping sight distance of a
vehicle is the sum of
• A. lag distance
• B. breaking distance

6. Stopping sight distance

7. Stopping Sight Distance

8. 2. Overtaking sight distance
• The minimum distance open to the vision of the driver of a
vehicle intending to overtake slow vehicle ahead with safely
against the traffic of opposite direction is known as the minimum
overtaking sight distance

9. Criteria for Measuring Sight Distance
• Height of Object
For stopping sight distance calculations, the height of
object is considered to be 600 mm [2.0 ft] above the road
surface.
For overtaking sight distance calculations, the height of
object is considered to be 1,080 mm [3.5 ft] above the
road surface.

10. Intermediate sight distance
• Intermediate sight distance equal to twice
stopping sight distance may be provided.
• The measurement of the intermediate sight
distance may be made assuming both the height
of the eye level of the driver and the object to be
1.2 m above the road surface.

11. Intermediate sight distance

12. 3. Sight distance at intersection
• It is important that on all approaches of intersecting
roads, there is a clear view across the corners from a
sufficient distance so as to avoid collision of vehicle.
• It is a very important at uncontrolled intersections.
• The area of unobstructed sight formed by the line of
vision is called sight triangle.

13. Sight distance at intersection

14. Any questions..!!!