Loose wheel nut indicator

[1] In 1990, Mike Marczynski, who was responsible for a commercial vehicle fleet, developed the locking system for lug nuts and initially marketed them in Great Britain under the Checkpoint brand name.

The product has also established itself in Germany, and trucks with the safety system can be seen more and more frequently on the Autobahn.

Lug nut indicators made of a material that can withstand high temperatures were developed especially for the needs of rescue vehicles, where the driving and braking behavior is significantly different.

A common type of loose wheel nut indicators are small pointed tags, usually made of fluorescent orange or yellow plastic, which are fixed to the lug nuts of the wheels of large vehicles.

[9] The system functions by detecting and recognizing vibrations which could indicate a loose wheel.