Post on 23-Jun-2015
description
Traffic Barriers
WHY ARE TRAFFICBARRIERS IMPORTANT?
Traffic barriers keep vehicles within their roadway and prevent vehicles from colliding with dangerous obstacles
PREVENTION Traffic barriers
installed at the road side also prevent out
of control vehicles from traversing
steep (non-recoverable) slopes
Common Sites for Installation of
Traffic Barriers:
Bridge ends Near steep slopes from
roadway limits At drainage crossings or
culverts where steep or vertical drops are present
Near large signs/ illumination poles or other roadside elements which may pose hazards
Roadside Barriers used to protect traffic
from roadside obstacles or hazards, such as:• slopes steep enough to
cause rollover crashes• fixed objects like bridge piers• bodies of water
used as wide medians, to prevent vehicles from colliding with hazards within the median
MEDIANS used to prevent
vehicles from crossing over a
median and striking an oncoming vehicle in a head-on crash Unlike roadside barriers, they must be designed to be struck from either
side
Bridge Barrier
designed to restrain vehicles from crashing off the side of a
bridge and falling onto the roadway, river or railroad below
usually higher than roadside barriers, to prevent trucks, buses,
pedestrians and cyclists from vaulting or rolling over the barrier
and falling over the side of the structure
Bridge rails are usually multi-rail tubular steel barriers or
reinforced concrete parapets and barriers
Work Zone Barriers
used to protect traffic from hazards in work zones
distinguishing feature is they can be relocated as conditions change in the road works
advantages can be that they are assembled without heavy lifting equipment
SAFER Barrier The “Steel and Foam Energy Reduction
(SAFER) barrier” – sometimes called a “soft wall” – is a technology found primarily on oval automobile race tracks and intended to make racing accidents safer
It was designed by a team of engineers led by Dean Sicking at the Midwest Roadside Safety Facility at the University of Nebraska-Lincoln.
SAFER Barrier
Initially installed at the Indianapolis Motor Speedway in 2002, in time for the Indianapolis 500
first "tested" by Robby McGehee in a crash during the first day of practice
The theory behind the design is that the barrier absorbs a portion of the kinetic energy released when a race car makes contact with the wall• This energy is dissipated along a longer portion of the wall,
instead of propelling the car back into traffic on the track The SAFER barrier also lessens damage to the car
itself, thereby reducing repair costs.
SAFER Barrier
Traffic Barrier Videos http://www.youtube.com/watch?v=yQd
1Hg0Nt30&feature=mfu_in_order&list=UL
http://www.youtube.com/watch?v=PTrbUokgohk
http://www.youtube.com/watch?v=5axpBcwkXD0&feature=related
http://www.youtube.com/watch?v=IEqfJoefdkU&feature=related
http://www.youtube.com/watch?v=KxattLEYmpo&feature=mfu_in_order&list=UL