A constant slope barrier is a traffic barrier

Traffic barrier

Traffic barriers keep vehicles within their roadway and prevent vehicles from colliding with dangerous obstacles. Traffic barriers installed at the road side also prevent errant vehicles from traversing steep slopes. Traffic barriers installed at the medians of divided highways are also referred...

 made of reinforced concrete and designed with a single slope that is used to separate lanes of vehicular traffic. Its advantages compared to more complex shapes arise because its performance is not as affected by changes in the height of the roadbed during repaving.

The Texas Constant-Slope Barrier is 1070mm (42in) high and has a constant slope face that makes an angle of 10.8 degrees with respect to the vertical. California has developed a constant slope barrier with an angle of 9.1 degrees with respect to the vertical. The Texas Constant-Slope barrier has performed similarly in crash tests to the Jersey barrier

Jersey barrier

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

. The California design compared similarly to the F-shape barrier

F-Shape Barrier

The F-shape barrier is a concrete crash barrier, originally designed to divide lanes of traffic on a highway. It is a modification of the widely-used Jersey barrier design, and is generally considered safer....

 in crash tests. The UK equivalent is the concrete step barrier

Concrete step barrier

A concrete step barrier is a safety barrier used on the central reservation of motorways and dual carriageways as an alternative to the standard steel crash barrier.The barrier has contained all vehicles up to 13.5 tonnes.-United Kingdom:...

.