Bridge head guardrail is also known as bridge end lap plate, is used in concrete bridge and road junction of a waveform guardrail, this waveform guardrail end and ordinary high-speed guardrail no difference, the other end is made of a bevel, can be better with the bridge contact surface fit. The function of this guardrail is the same as the bridge end, which facilitates the connection between waveform guardrail and bridge, makes the road and bridge road more smooth, and ensures vehicles and pedestrians to rush out at the junction. This kind of guardrail has the advantage of convenient installation, simple manufacture, can replace the bridge end, play a better protective role.