Cable barriers are flexible barriers, made from steel cables mounted on weak steel posts, resulting in less occupant impact force as it absorbs energy from the crash, capturing or redirecting the vehicle. Due to larger deflection, median width is an important consideration. These barriers are more adaptable to slopes typically found in medians.

A cable barrier, also known as cable guardrail, wire rope safety barrier, is the mainly type of flexible highway fences for keeping vehicles within the limits of correct way. Three or four high tensile wire ropes, mounted on the post, will absorb the maximum energy by flexing to cushion the unavoidable impact.

A cable barrier, sometimes referred to as guard cable or wire rope safety barrier (WRSB), is a type of roadside or median safety traffic barrier / guard rail. It consists of steel wire ropes mounted on weak posts.

The barriers are made of three or four steel cables strung on posts. When a car hits the barrier, the posts break and the cables flex, absorbing much of a crash’s kinetic energy. This redirects the vehicle along the median, preventing a cross-median crash.

Cable median barriers (CMB) are life saving, adaptable traffic devices ideally suited for use in existing medians to prevent cross-over crashes, and are one of the most effective safety measures state transportation departments can deploy to protect motorists on today's congested highways.