What is the correct procedure for coupling a trailer to a tractor?

The correct procedure for coupling a trailer to a tractor involves aligning the tractor and trailer correctly and ensuring that the fifth wheel is properly latched. This is critical for maintaining a secure connection between the two vehicles, which is essential for safe driving and preventing accidents.

When the fifth wheel is aligned with the trailer’s kingpin, it must be engaged fully to lock into place. This ensures that the trailer is securely attached and that the connection can handle the stresses of towing. Failing to properly latch the fifth wheel can lead to the trailer disconnecting from the tractor while in motion, resulting in potential hazards on the road.

The other options demonstrate unsafe practices or incomplete procedures that could compromise safety. For example, just driving close to the trailer without properly coupling and latching it invites a high risk of detachment. Checking only the trailer's brakes, while important, does not replace the necessity of properly connecting the trailer to the tractor. Pulling away without testing the connection is also dangerous, as it assumes that the vehicle is secured when it may not be, leading to possible accidents.