How should tire pressure be checked during a pre-trip inspection?

Using a tire pressure gauge is the most accurate and reliable method for checking tire pressure during a pre-trip inspection. Tire pressure gauges are designed to measure the air pressure inside tires precisely, ensuring that they are inflated to the manufacturer's recommended levels. Proper tire pressure is crucial for vehicle safety, fuel efficiency, and optimal tire wear.

Visual inspection alone is insufficient because it does not provide numerical data on the exact pressure within the tire. While a visual check can sometimes identify obvious issues like low inflation or visible damage, it cannot determine whether the pressure is within the acceptable range. Pressing down on the tire with hands can give a rough sense of its firmness but is not an accurate measure and can lead to conclusions that may not reflect actual tire condition. Similarly, using a temperature reading does not convey the necessary information about tire pressure; temperature variations can affect tire pressure but do not replace the need for an actual pressure check. Thus, using a tire pressure gauge is the best practice for ensuring tire safety and performance.