A Jersey barrier or Jersey wall is a modular concrete barrier employed to separate lanes of traffic. It is designed to minimize vehicle damage in cases of incidental contact while still preventing the crossover case of a head-on collision.

Bridge barrier is designed to restrain vehicles from crashing off the side of a bridge and falling. Onto the roadway, river or railroad below. It is usually higher than roadside barrier, to prevent

Crash barriers can be rigid type, using cast-in-situ precast reinforced concrete panels, or of flexible type constructed using metallic cold-rolled and/ or hot-rolled sections, the metallic type, called semi-rigid type, suffer large dynamic deflection of the order of 0.9 to 1.2m, or on impact, whereas, the 'rigid' .