New study shows penny test is outdated; tire must have an eighth inch of tread. Oct. 3 , 2007 — -- Forty-three states require motorists to get new tires when the tread wears down to a 16th of an ...

To check tyre tread properly, use the 20p coin test (or a penny if you’re in the US): insert the coin into the main tread ...

Fans of the Gadsden Flag may soon be able to display its familiar rattlesnake and "Don't Tread on Me" message every time they pull out of the driveway. At least three states -- Virginia, Nevada and ...