Stop barrier in road for vehicles with pneumatic tires consists of transverse groove in road with pivoting sharp spikes set to puncture tire rolling in wrong direction

摘要

The barrier (1) incorporates a groove in the road lined with a top-hat section trough (3), and covered by a flat plate (5) with slits through which sharp triangular spikes (15) may protrude. The spikes are mounted on a shaft (17) which can rotate and are connected together by a rod (21) passing through the free ends (20) of levers (16) in one piece with the spikes. Actuators (34) may lift up the levers and spikes to their operative position and are pivoted in the lower corner (35) of the groove. The spikes puncture a tire (2) rolling in the wrong direction.