Quantcast Concrete Median

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Testing. A vehicle barrier system, consisting of 11, 8-inch (20-cm) diameter bollards
connected with a 12-inch (30-cm) U-channel rail, was crash-tested with a 15,000-pound (6,818-
kg) vehicle traveling at 47 mph (76 kph). The vehicle failed to penetrate. On another occasion,
a vehicle with the same weight, but traveling at 43.5 mph (70 kph), penetrated the barrier a
distance of 19.6 feet (6 m).
In another test, a single, 8-inch (20-cm) diameter, 1/2-inch (1.27-cm) wall steel pipe,
concrete-filled bollard was impacted by a 4,500-pound (2,045-kg) pickup truck traveling at 30
mph (48 kph). The vehicle penetrated 17.5 feet (5.3 m).
Concrete Median
Description. A concrete highway median (also known as a Jersey Bounce or Jersey
Barrier) can be effectively used as a perimeter vehicle barrier. It can either be erected from
precast tongue-and-groove sections or cast in place with special concrete-forming equipment. It
is especially effective for impact angles less than 30 degrees and is appropriate for locations
where access roads are parallel to the barrier. Complete penetration is possible with light
vehicles; however, damage to the vehicle will be extensive.
Testing. A non-reinforced, anchored, concrete median barrier was tested with a
4,000-pound (1,818-kg) vehicle at 50 mph (81 kph), penetrating the barrier 20 feet (6 m). The
vehicle had extensive front-end damage, and the occupants would have received serious to
critical injuries. During the impact, a section of the barrier was broken and overturned. These
barriers should be set in a concrete foundation, as shown in Figure 26, for applications where the
impact angle exceeds 30 degrees.


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