Because they offer some advantages over
other barrier systems, high-tension cable
barriers are becoming more popular in
several states, including Iowa. But first
responders need to take special precautions
when removing a vehicle that has become
entangled in a high-tension cable system.
Anatomy of a high-tension cable system
NCHRP-350 certified systems are manufactured
by various companies. In general,
they consist of three or four cables (21-wire,
¾-in. rope), held at various heights on
posts. The posts are designed to bend or
break on impact.
End anchors hold the cables in constant
tension—generally from 3,000 to 8,000
pounds. The tension can be adjusted
and the cables can be released
