This document discusses road safety and road safety engineering. It notes that over 1.3 million deaths occur each year from traffic accidents, with 90% occurring in low and middle income countries. Road safety engineering aims to modify the physical road environment to reduce risks for all users. It involves road design, traffic engineering, analysis, and applying techniques like proper super elevation, pavement structure, traffic signs and signals, and designing intersections and interchanges. The goal is to counteract forces that could cause vehicles to overturn or skid and help ensure safe travel.

1. Prepared by:-
Prajjwal Paudel

2. Introduction
 Road safety is one of the global problem nowadays.
 1.3 million deaths each year on roads of the
world(about 3600 per day, 150 per hour and more than 2 per minute.)
 Over 15 millions are seriously injured.
 WHO predicts that by 2020 there will be 2.3
million traffic crash deaths worldwide, constituting
27.4% of all injury related deaths.
 90% of these will occur in low and middle income
countries.

3. Causes of Road Accidents
Pedestrian Errors Road defects
Vehicle defects
Environmental
factors
Drivers’
behavior

4. Driver’s behavior

5. Road defects

6. Vehicle Defects

7. Environmental factors

8. What is road safety engineering??
Road safety engineering is :
“The modification of the physical road environment,
using proven process and techniques, that endeavors
the risk for all road users”.

9. What is road safety engineering??
A profession that combines:
 Road designing
 Traffic engineering
 Human factors
 Detailed analysis
 Lots of judgment

10. Designing of Road
Super elevation
Pavement structure and Designing
Maintaining traffic signs and signals
Fly over, intersection and interchange

11. Superelevation
In order to counteract
the effect of centrifugal
force and to reduce the
tendency of the vehicle
to overturn or skid, the
outer edge of the
pavement is raised with
respect to the inner
edge, thus providing a
transverse slope
throughout the length of
the horizontal curve.
This transverse
inclination to the
pavement surface is
known as
superelevation.

12. Superelevated pavement

13. Pavement
Flexible
pavement
Rigid
pavement

14. Flexible Pavement

15. Rigid Pavement

16. Traffic signs

19. Fly over, Intersection and interchange

20. Geometric designing of Road
PIEV
Theory

23. Tips for hill
driving
• Health check
• Be light on turns
• Keep within speed
limit even on a
straight stretch
• Driving at night
• Overtaking
• Escape Ramps

25. WISHING YOU SAFE JOURNEY…..