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Prepared by:- 
Prajjwal Paudel
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.
Causes of Road Accidents 
Pedestrian Errors Road defects 
Vehicle defects 
Environmental 
factors 
Drivers’ 
behavior
Driver’s behavior
Road defects
Vehicle Defects
Environmental factors
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”.
What is road safety engineering?? 
A profession that combines: 
 Road designing 
 Traffic engineering 
 Human factors 
 Detailed analysis 
 Lots of judgment
Designing of Road 
Super elevation 
Pavement structure and Designing 
Maintaining traffic signs and signals 
Fly over, intersection and interchange
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.
Superelevated pavement
Pavement 
Flexible 
pavement 
Rigid 
pavement
Flexible Pavement
Rigid Pavement
Traffic signs
Fly over, Intersection and interchange
Geometric designing of Road 
PIEV 
Theory
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
WISHING YOU SAFE JOURNEY…..

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Global Road Safety Crisis and Engineering Solutions

  • 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
  • 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.
  • 13. Pavement Flexible pavement Rigid pavement
  • 17.
  • 18.
  • 19. Fly over, Intersection and interchange
  • 20. Geometric designing of Road PIEV Theory
  • 21.
  • 22.
  • 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
  • 24.
  • 25. WISHING YOU SAFE JOURNEY…..