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Abstract:Three
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strand
cable barriers were first developed in the 1960’s and found to have several desirable
characteristics as compared to other roadside barriers such as guard rail
.
Brifen Wire Rope Safety Fence is
a four strand woven wire rope intended to prevent vehicles f
rom veering off a road. This experimental
feature is manufactured by Brifen USA Inc. and adheres to NCHRP 350 test level three. This designation
implies that the product can withstand the impact of a vehicle traveling at 60 mph. The purpose of this
inve
stigation was to evaluate the woven rope system in comparison to a more widely used three wire rope
cable barrier. Comparatively, the four stand woven wire rope is marketed to provide enhanced levels of
safety while providing substantial reductions in ins
tallation, maintenance and repair costs.
The Brifen system required an increased level of effort during initial installation when compared with
a standard three
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cable wire rope fence
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The resulting system appeared to be stronger, with less deflection
in
the cable along its entire length
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The initial installation encountered no difficulties, as observed by
Construction, Operations or Research staff.
Through site observations conducted by Materials and Research personnel it appears that the
safety fence is
performing considerably well, however the posts under torque is causing concern of how well
the fence will continue to work when vehicles make contact with it. The excluder caps, post caps, and
locator pegs should be replaced with a more durable material
due to excessive cracking and breaking. This
fence might not be an ideal choice for Vermont due to the inclement weather and the involved tasks of
repairing the fence after accidents. Operations have claimed that the repair p
rocess is quite extensive
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