highway balustrade or barrier system, pole for a highway balustrade or barrier system, baseplate and support pole, trolley, and method for constructing a highway balustrade or barrier system

摘要

Roadway barrier or guard rail system (10) having a post (12) and beam (14) construction wherein said beam is mounted to said post by means of an intervening carriage (20), said carriage being adapted to slide relative to said post in the event of a collision, frictional control means between said carriage and said post being provided so that said carriage has a shape which assists in the generation of frictional forces, said carriage engaging at least a portion of the outer and or inner periphery of said post to enable sliding movement of said carriage relative to said post, wherein the post includes means to control the amount of force required to disconnect or allow the carriage to move relative to the post.