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HIGHWAY SAFETY
INTRODUCTION
• Highway –
▫ A highway is a busy road with many lanes.
▫ Highways are usually the quickest route for
driving between one city and another.
▫ Highways are always considered public land, and
they're maintained by the respective authorities.
• Safety –
▫ Freedom from the occurrence or risk of injury,
danger, or loss. the quality of averting or not
causing injury, danger, or loss.
INTRODUCTION
• Highway safety –
▫ Highway safety refers to the methods and measures
used to prevent road users from being killed or
seriously injured.
▫ Why is it important?
 Heavier traffic leads to likelihood of accidents occurring.
 More than “1.3 million people die every year in a car
crash” while another “50 million people are injured or
disabled from crashes” in the world.
 In fact, “car crashes are the 9th leading cause of death” in
the world.
INTRODUCTION
• Why road accidents are happening?
▫ Unawareness of road rules and regulations –
 Over speed driving
 Drink and drive
 Sleeping on the wheel
▫ Road construction –
 Oil spills
 Improper road construction
▫ Vehicle defects –
 High speed wheel burst
Etc…
INTRODUCTION
• Why safety measures are adopted?
▫ To reduce the number of accidents.
▫ For safer journey of travelers.
▫ Improve the traffic system.
▫ To increase the quality of transit system.
• How it is done?
▫ Adopt the safety measures described by the
authorities.
▫ It will be discussed further.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
• Cross Sections
• Rumble Strips
• Design of Roadside
• Junctions
• Linear villages
• Roundabouts
• Traffic calming road design
• Traffic signs
• Pedestrian crossings
• Barriers
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
1. Cross Sections –
▫ It includes –
 The pavement with the vehicle lanes, edge strip and
markings.
 The emergency zone and obstacle free zone.
 The embankments and cutting slopes.
 The width of the cross section is determined by the
pavement related to the number of lanes.
 The required width of the edge strip.
 The shoulders and earthwork slopes and depth.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
2. Rumble Strips –
 To reduce the number and severity of roadway
departure crashes, or run-off-the-road and cross
center line crashes on 2-lane, rural, and undivided
roads.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
2. Rumble Strips –
i. Shoulder rumble strips:
Placed on highway
shoulders along the edge of
the travel lane, to prevent
single vehicle run-off-the-
road-crashes.
ii. Center line rumble strips:
Placed on or near the center
line, to prevent head-on
crashes and opposite
direction sideswipe crashes.
They can also be helpful to
prevent some crashes when
a driver veers across the
center line.
iii. Advantages of Rumble
Strips –
 Alert drivers upon
drifting or deviation.
 The reflective pain helps
to increase visibility.
 Reduce the number of
crashes.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
3. Design of road side –
▫ It must comply the following essential
requirements:
 The road must be free of ditches and screening
should be done properly.
 Shoulders and edge strips must be provided.
 Super elevations must not be too steep.
 Avoid sharper turns.
 Emergency lanes must be provided.
 Wider obstacle free zones to reduce the risk in case
of road run-off accidents.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
4. Junctions –
 A road junction is a location where multiple roads
intersect, allowing vehicular traffic to change from
one road to another.
 A road junction has to fulfill the following
requirements –
 Visible
 Overseeing possibility
 Comprehensible
 Completeness
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
5. Linear Villages –
 A linear villages is that part of a transit road which
lies within a built up area.
 Passing a road from public areas must comply with
the special safety needs:
 Pedestrian safety
 Speed reduction measures
 Footpaths, side railings and shoulders
 Avoid sharp turns and blind corners
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
6. Traffic calming road design
 Intended to slow down the
traffic.
 Used primarily as a safety
measure on low volume and
low speed roadways.
 It may involve some physical
changes to the roadway that
slow traffic down.
 The examples are as follows
–
 Lane stripping
 One way
 Speed humps/breaks
 Road Ahead closed
 Pedestrian
crossings/crosswalks
 Signal Phasing
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
7. Innovative interchange and intersection design
–
▫ Using innovative design interchanges and
intersections to help move large volumes of traffic
through limited amounts of space safety
efficiently.
▫ Following are the main types:
i. Diverging Diamond Interchange (DDI)
ii. Echelon Interchange
iii. Single Point Interchange (SPI)
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
i. Diverging Diamond Interchange (DDI)
 This innovative interchange, sometimes called a "double
crossover diamond.“
 Purpose:
▫ Increase capacity
▫ Safety
▫ Decrease congestion
▫ Minimize the cost of new infrastructure
 Advantages
▫ Safety
▫ Greater capacity and efficiency
▫ Easy navigation
▫ Suitability
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
ii. Echelon Interchange
• This innovative interchange is designed to
accommodate two high-volume streets. An echelon
introduces a bridge, splitting traffic into two levels,
creating two separated intersections of one-way
streets. Because there is no opposing traffic for left
turns there is more green light time for all
movements
▫ Advantages
 Safety
 Greater capacity and efficiency
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
iii. Single Point Interchange
 All traffic is controlled by a single set of traffic
signals located in the center of the intersection.
 Reasons for considering SPI:
 Better Safety
 Greater capacity and efficiency than conventional
designs
 Also accommodates large trucks.
 Ease of Navigation
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
8. Traffic Signs
 Traffic signs or road signs are signs erected at the side of
or above roads to give instructions or provide
information to road users.
 Traffic signs generally
 Control the flow of traffic
 Warns about hazards ahead
 Guide to destination
 Informs roadway services.
 Traffic signs are intentionally color coded to assist the
operator.
 In traffic signs, fluorescent material is used.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
 Various sign boards are used, such as
i. Stop & Yield Sign Boards:
A STOP sign is a traffic sign to notify drivers to
completely halt while YIELD means to slow down to at a
point.
ii. Warning Signs:
Alerts to hazards or changing in conditions such as
changes in road layout, proximity to a school zone,
sharp turns etc.
iii. Guide signs:
i. Indicates route, markers, distance & destination signs,
and informational signs.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
iv. Construction & Maintenance Road Work Warnings
▫ The work areas are protected from traffic by orange (or
yellow) warning signs during the construction or repairing
works.
▫ Help to guide pedestrians and vehicle traffic safely
through a work zone and past any hazards.
HIGHWAY SAFETY MEASURES ADOPTED
BY CIVIL ENGINEERS
9. Roundabouts
 "A roundabout is a type of circular intersection or
junction in which road traffic flows almost
continuously in one direction around a central
point."

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Highway safety

  • 2. INTRODUCTION • Highway – ▫ A highway is a busy road with many lanes. ▫ Highways are usually the quickest route for driving between one city and another. ▫ Highways are always considered public land, and they're maintained by the respective authorities. • Safety – ▫ Freedom from the occurrence or risk of injury, danger, or loss. the quality of averting or not causing injury, danger, or loss.
  • 3. INTRODUCTION • Highway safety – ▫ Highway safety refers to the methods and measures used to prevent road users from being killed or seriously injured. ▫ Why is it important?  Heavier traffic leads to likelihood of accidents occurring.  More than “1.3 million people die every year in a car crash” while another “50 million people are injured or disabled from crashes” in the world.  In fact, “car crashes are the 9th leading cause of death” in the world.
  • 4. INTRODUCTION • Why road accidents are happening? ▫ Unawareness of road rules and regulations –  Over speed driving  Drink and drive  Sleeping on the wheel ▫ Road construction –  Oil spills  Improper road construction ▫ Vehicle defects –  High speed wheel burst Etc…
  • 5. INTRODUCTION • Why safety measures are adopted? ▫ To reduce the number of accidents. ▫ For safer journey of travelers. ▫ Improve the traffic system. ▫ To increase the quality of transit system. • How it is done? ▫ Adopt the safety measures described by the authorities. ▫ It will be discussed further.
  • 6. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS • Cross Sections • Rumble Strips • Design of Roadside • Junctions • Linear villages • Roundabouts • Traffic calming road design • Traffic signs • Pedestrian crossings • Barriers
  • 7. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 1. Cross Sections – ▫ It includes –  The pavement with the vehicle lanes, edge strip and markings.  The emergency zone and obstacle free zone.  The embankments and cutting slopes.  The width of the cross section is determined by the pavement related to the number of lanes.  The required width of the edge strip.  The shoulders and earthwork slopes and depth.
  • 8. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 2. Rumble Strips –  To reduce the number and severity of roadway departure crashes, or run-off-the-road and cross center line crashes on 2-lane, rural, and undivided roads.
  • 9. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 2. Rumble Strips – i. Shoulder rumble strips: Placed on highway shoulders along the edge of the travel lane, to prevent single vehicle run-off-the- road-crashes. ii. Center line rumble strips: Placed on or near the center line, to prevent head-on crashes and opposite direction sideswipe crashes. They can also be helpful to prevent some crashes when a driver veers across the center line. iii. Advantages of Rumble Strips –  Alert drivers upon drifting or deviation.  The reflective pain helps to increase visibility.  Reduce the number of crashes.
  • 10. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 3. Design of road side – ▫ It must comply the following essential requirements:  The road must be free of ditches and screening should be done properly.  Shoulders and edge strips must be provided.  Super elevations must not be too steep.  Avoid sharper turns.  Emergency lanes must be provided.  Wider obstacle free zones to reduce the risk in case of road run-off accidents.
  • 11. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 4. Junctions –  A road junction is a location where multiple roads intersect, allowing vehicular traffic to change from one road to another.  A road junction has to fulfill the following requirements –  Visible  Overseeing possibility  Comprehensible  Completeness
  • 12. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 5. Linear Villages –  A linear villages is that part of a transit road which lies within a built up area.  Passing a road from public areas must comply with the special safety needs:  Pedestrian safety  Speed reduction measures  Footpaths, side railings and shoulders  Avoid sharp turns and blind corners
  • 13. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 6. Traffic calming road design  Intended to slow down the traffic.  Used primarily as a safety measure on low volume and low speed roadways.  It may involve some physical changes to the roadway that slow traffic down.  The examples are as follows –  Lane stripping  One way  Speed humps/breaks  Road Ahead closed  Pedestrian crossings/crosswalks  Signal Phasing
  • 14. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 7. Innovative interchange and intersection design – ▫ Using innovative design interchanges and intersections to help move large volumes of traffic through limited amounts of space safety efficiently. ▫ Following are the main types: i. Diverging Diamond Interchange (DDI) ii. Echelon Interchange iii. Single Point Interchange (SPI)
  • 15. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS i. Diverging Diamond Interchange (DDI)  This innovative interchange, sometimes called a "double crossover diamond.“  Purpose: ▫ Increase capacity ▫ Safety ▫ Decrease congestion ▫ Minimize the cost of new infrastructure  Advantages ▫ Safety ▫ Greater capacity and efficiency ▫ Easy navigation ▫ Suitability
  • 16. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS ii. Echelon Interchange • This innovative interchange is designed to accommodate two high-volume streets. An echelon introduces a bridge, splitting traffic into two levels, creating two separated intersections of one-way streets. Because there is no opposing traffic for left turns there is more green light time for all movements ▫ Advantages  Safety  Greater capacity and efficiency
  • 17. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS iii. Single Point Interchange  All traffic is controlled by a single set of traffic signals located in the center of the intersection.  Reasons for considering SPI:  Better Safety  Greater capacity and efficiency than conventional designs  Also accommodates large trucks.  Ease of Navigation
  • 18. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 8. Traffic Signs  Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users.  Traffic signs generally  Control the flow of traffic  Warns about hazards ahead  Guide to destination  Informs roadway services.  Traffic signs are intentionally color coded to assist the operator.  In traffic signs, fluorescent material is used.
  • 19. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS  Various sign boards are used, such as i. Stop & Yield Sign Boards: A STOP sign is a traffic sign to notify drivers to completely halt while YIELD means to slow down to at a point. ii. Warning Signs: Alerts to hazards or changing in conditions such as changes in road layout, proximity to a school zone, sharp turns etc. iii. Guide signs: i. Indicates route, markers, distance & destination signs, and informational signs.
  • 20. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS iv. Construction & Maintenance Road Work Warnings ▫ The work areas are protected from traffic by orange (or yellow) warning signs during the construction or repairing works. ▫ Help to guide pedestrians and vehicle traffic safely through a work zone and past any hazards.
  • 21. HIGHWAY SAFETY MEASURES ADOPTED BY CIVIL ENGINEERS 9. Roundabouts  "A roundabout is a type of circular intersection or junction in which road traffic flows almost continuously in one direction around a central point."