You wouldn’t start a drive without filling up with fuel, right? CDL Pre-Trip Inspection will prepare you for how to do this, and your other necessary tasks before getting out on the road. The CDL Pre-Trip inspection is critical in safe traveling. You must know the proper functions and rate at which things are stable. This section is especially useful since you will be performing a pre-trip inspection every time you leave for the open road, and a critical part of your permit testing experience.