Vermont CDL Permit Practice Test

The assertion is true because ensuring that the fifth wheel is properly locked onto the kingpin is a crucial safety step before heading out on the road with a trailer. To confirm that the fifth wheel is securely locked, the most effective method is to visually inspect it from the back. This allows the driver to see the locking mechanism and check that it has engaged correctly with the kingpin.

Visually verifying the lock’s engagement helps prevent potential accidents that can occur if the trailer becomes detached while in motion. This practice is critical regardless of the age or condition of the trailer, as the basic mechanics of the fifth wheel and kingpin connection remain constant. Therefore, a thorough inspection each time a trailer is connected is essential for safe operations.