Spike strip

A spike strip (also known as traffic spikes, tire shredders, one-way traffic treadles, stingers, stop sticks, a stinger in police slang, and formally known as a tire deflation device) is a device used to impede or stop the movement of wheeled vehicles by puncturing their tires. Generally, the strip is composed of a collection of 35 to 75 mm (1.5 to 3 inches) long metal barbs, teeth or spikes pointing upward. The barbs are designed to puncture and flatten tires when a vehicle is driven over them. The barbs may be hollow or solid. Hollow barbs are designed to become embedded in the tires and allow air to escape at a steady pace in an attempt to reduce the risk of the driver crashing into oncoming traffic or the surroundings. One type was co-invented by Donald Kilgrow, a retired Utah Highway Patrol trooper, along with a design engineer, but they are historically just a development of the caltrop, anti-vehicle versions being used as early as the Second World War by the British Army.