The tire boot has been in use for sometime for illegally-parked vehicles, but the Barnacle is a windshield-blocking device that aims to be more efficient.
Developed by the team at Ideas That Stick, the Barnacle is designed to be affixed to a vehicle's windshield rather than the wheel. This allows the vehicle to not be driven, but still towed should the driver not come contact parking enforcement in a timely manner.
The Barnacle works by being affixed onto the windshield and completely blocking the sightlines for the driver. The Barnacle windshield-blocking device affixes easily onto a vehicle, but won't let go if it's tried to be removed thanks to commercial-grade technology and an alarm system that sets off if it's tampered with.