How should you check the air pressure in the vehicle’s tires?

The recommended method for checking the air pressure in a vehicle's tires is to use a tire pressure gauge to ensure they are inflated to the specified PSI. This method provides an accurate measurement of the tire pressure, which is critical for safe driving and optimal vehicle performance.

Tire pressure can significantly affect a vehicle's handling, fuel efficiency, and overall safety. An under-inflated or over-inflated tire can lead to poor handling, increased tire wear, and a higher risk of tire blowouts. By using a tire pressure gauge, drivers can ensure that their tires are at the appropriate pressure levels as recommended by the vehicle's manufacturer, which is typically found in the owner's manual or on a sticker inside the driver's door.

Other methods, such as visually inspecting for bulges or using your hand to feel for firmness, do not provide a reliable or precise measure of tire pressure. These methods might indicate general tire condition but cannot ascertain the exact PSI, which is crucial for safety and performance. Similarly, looking for the tread depth indicator does not relate directly to tire pressure but focuses instead on tread wear, which is another important aspect of tire maintenance. However, it does not support the direct check of air pressure.