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Trucks often seem like enigmatic machines on the road, offering little clues about their inner workings that leave typical sedan drivers scratching their heads. We've already discussed why they have spikes on their tires, why they warn drivers when making right (but not left) turns, and even the purpose of the ‘spinny thing’ atop certain delivery vehicles.
One more curious feature to add to the list: why some trucks have plastic strips hanging from the lug nuts of their wheels.
As explained by Jalopnik, these strips serve as an inexpensive yet effective method for detecting wheel issues. Positioned beneath a tightened lug nut, they signal that the wheel is in motion.
But if the truck is on the move, what could be the problem? A few things could cause issues: a truck’s air braking system might freeze or fail to engage properly after the engine restarts, or the brakes could be worn or rusted.
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By adding a wheel rotation indicator, drivers can easily monitor the wheel's performance. This feature makes it simple to spot potential issues when checking the wheels, especially from the rearview mirror, as the indicator usually extends about 2 inches from the rim.
The strips used are never black but are typically orange or yellow for better visibility. These are marketed under the brand name Skiddd, among others. While they might seem like simple strips of plastic, they offer a practical solution for preventing damage and accidents, serving as one of the most basic safety monitoring tools on the road today.
