As the air inside your tire cools, it contracts and applies less pressure against the inside of your tires.
What to try: Gas stations often have air machines for a quick top-off before you hit the highway.
It's also not a bad idea to keep a battery-powered tire inflator in your car, garage, basement or apartment.
Try to drive as little as possible before topping off your tires.
Don't ignore the warning if it goes away after driving a bit. The air inside your tires may warm and expand while you drive, but you may still need to add more air.
If you're not sure about the right PSI for your tires, check your owner's manual or the sticker on the driver's-side door jamb, near the striker plate (step out of the car and pop open the door to find it).
If you're driving an older car without tire pressure sensors, check your tire pressure regularly, especially as the mornings get colder.
What to expect: After filling up your tires to the correct PSI, the warning light should go away after driving for a bit.
