Yes, it is unsafe to drive on worn tires. Bald tires, or those that have very little or no tread depth, have a longer stopping distance. They are also more likely to: slide, skid, puncture, hydroplane, lose traction of the roadway, lose air pressure, or blowout. All of these problems increase the risk of a car accident. They are even more dangerous on large vehicles, like pick-up trucks, especially when they are hauling cargo or a semitrailer. On wet roads, the dangers of driving on bald tires becomes even more pronounced.