What condition can a driver check on tires during a pre-trip inspection?

During a pre-trip inspection, it is essential for a driver to check the tread depth and pressure of the tires. These two factors are critical for ensuring safe driving conditions. Tread depth affects the vehicle's traction and handling, especially under wet or slippery conditions. Insufficient tread can lead to hydroplaning or decreased braking effectiveness. Meanwhile, proper tire pressure is crucial for maintaining optimal contact with the road, improving fuel efficiency, and preventing tire blowouts.

While the condition of tire valve stem caps is also important for maintaining air pressure, checking the tread depth and pressure provides a more comprehensive assessment of tire safety and performance. Color and brand do not significantly impact tire functionality in the context of safety and vehicle operation. Thus, focusing on tread depth and pressure is a fundamental part of vehicle safety inspections.