Height restrictors consist of all steel construction coated white with white powder coated aluminium arm and knocking arm for driver warning. The Height Restrictors triangular steel arm carrier is mounted on the hinges of the main support post which in turn supports the arm. The height restriction barriers knocking arm is suspended by adjustable links in order to adjust the height on site.
The other end of the restriction barriers support arm is secured in a catcher post, which is height adjustable to take into account variation in the road camber. The height restrictor's arm is locked into the catcher post through a padlockable elongated bar which allows control from normal pedestrian height. A second catcher post can be provided to lock the arm in the opened position.