When a car is driven, wheels rotate and are in contact with ground and also experience frictional force, we know due to friction heat is also generated so tyres become hot or the temperature of tyres rises due to which temperature of gas inside the tyre also rises, but the volume of the tyre remains same , we know from Charles law when volume is constant , pressure is directly proportional to Temperature, since temperature is rising so pressure of tyre due to gas also rises.