In case of air pressure loss, the tire can be driven on for 50 miles up to a speed of 50 mph, preventing the driver from being stranded on the side of the road. As a result, the driver is able to drive to a close location where they can change or repair the tire. These tires are meant to be mounted on vehicles that have no space for a spare tire. Regular tires cannot be mixed with run flat tires, as run flat tires have a heavier construction.