Tires can be an “out of sight, out of mind” component on your vehicle, but worn tires can be hazardous, especially during an unexpected downpour. New research from AAA finds that driving on relatively worn tires at highway speeds and on wet surfaces can increase stopping distances by nearly 90 feet.

That’s more than the length of an eighteen-wheeler.

In partnership with the Automobile Club of Southern California’s Automotive Research Center, AAA conducted testing to understand performance differences at highway speeds between new, all-season tires and those worn to a depth of 4/32″ on wet pavement. The study examined both passenger cars and light trucks.