Retractable barrier strip

A barrier strip for puncturing a vehicle tire, comprising:

• a) a plurality of adjacent barrier blocks, each block having a face for the tire to roll thereon and over, a hollow-bed portion disposed within the face, and a first and second bore;
• b) connecting means comprising a shaft rotatably disposed in the first bore of each block, wherein the shaft pivotally and removably interconnects with a corresponding mating shaft of an adjacent barrier block;
• c) tire-puncture means removably disposed in the shaft of each of the barrier blocks, and wherein the shaft is rotated to an armed position for puncturing the tire, and counterrotated to a retracted position wherein the tire-puncture means is received within the hollow-bed for not puncturing the tire;
• and
• d) control means comprising first and second actuation cables running through the second bore of each of the interconnected blocks, each cable having a cable connection end for connecting to the shaft of a barrier block, and a cable activation end for communicating with an activation means, and wherein a pull force selectively exerted by the activation means on the first actuation cable causes each interconnecting shaft to rotate the tire-puncture means to the armed position, and a pull force selectively exerted by the activation means on the second actuation cable causes each interconnecting shaft to counterrotate the tire-puncture means to the retracted position;
• and
• wherein the tire puncture apparatus is rolled up for retrieval, portability, and storage purposes and unrolled and extended in the deployed position for use, and wherein the strip rests stable in a deployed position of use and remains substantially motionless as the tire rolls thereon and over the strip.