Increasing temperature raises the kinetic energy of gas particles, causing them to move faster.
When a car is driven for a long period, the friction between the tires and the road heats the air within the tires. This temperature increase has a direct effect on the kinetic energy of the gas particles within the tire. The gas particles inside the tire begin to move faster as their kinetic energy increases with growing temperature. As the particles move quickly, they collide more frequently and powerfully with the tire’s inner walls. This higher accident rate raises the pressure inside the tire. If the temperature rises significantly, the tire pressure may rise enough to make the tire feel firmer or expand slightly. This is why tire pressures are frequently tested when the tires are cold because hot tires have a higher pressure due to increased particle speed.