Pennsylvania CDL Practice Exam 2025 - Free CDL Practice Questions and Study Guide

Letting air out of hot tires before driving is not safe because it can lead to under-inflation. Tires naturally expand and the air pressure increases when they are heated due to driving or environmental conditions. Instead of releasing air to cool them down, it’s important to check tire pressure only when the tires are cold, meaning they haven't been driven on for several hours. This helps ensure that the tire pressure is within the manufacturer’s recommended levels, which is crucial for proper handling, fuel efficiency, and safety on the road. Operating with under-inflated tires can increase the risk of tire blowouts and negatively affect vehicle performance.