Some 28 million vehicles are riding around on at least one bald tire, according to a recent Rubber Manufacturers Association (RMA) survey.
The survey also shows that 64% of motorists do not know how to tell if a tire is bald. Nine percent, according to the RMA, never check their tires' tread depth.
An RMA survey from earlier this year revealed that only 17% of vehicles had four properly inflated tires, 55% of vehicles had at least one under-inflated tire, and 15% of vehicles had at least one tire that was under-inflated by eight psi.
