Spike strip

A lock nail, nail chain or nail strips in Switzerland Nagelgurt and colloquially as " killer tire " is a defensive weapon with which the rubber tires of vehicles can be destroyed when Additionally driving. Precursor of the nail strip were single crow's feet.

Construction

The nail barrier usually consists of a metal mesh or chain attached addressed to the nails or now mostly large metal spikes upward. The nails are hollow and have holes so that air and then quickly escapes from the tires when they get stuck in it.

Stop sticks

New Nail Block, so-called stop sticks, are one meter long three-sided plastic rods. Inside protrude 36 sharpened tubes in all three directions. If the stop sticks thrown into the street, always shows a row of nails upwards. With three rods connected three meters of a road can be shut off. At a weight of 400 kilograms of the triangular plastic rod is compressed and the nail lock contained therein with hollow tubes may penetrate the tire. Unlike traditional nail chains, the air escapes very slowly to prevent the tires burst and the getaway car rolls over.

Fixed nail strips

Fixed nail strips are mounted in depressions or bumps can be lowered into the street. These locks can be extended if necessary. Other barriers are fixed obliquely, mobile installed in the street. About continuing on the same lock from the right side, fold the nails downward away, sail from the wrong side, they line up so that they block the street in one direction only.