Traffic spikes

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. ... Remotely deployable spike strips have been invented to reduce the danger to police officers deploying them. Spike strips are also built into some parking barriers to control traffic flow. [Spike strip. Wikipedia]