What must you do after attaching a semitrailer?

After attaching a semitrailer, it is essential to check the fastening and locking system of the fifth wheel to ensure that the connection between the tractor and the trailer is secure. This prevents dangerous situations where the trailer could disconnect during driving. You must also connect and check all hoses and cables, such as brake lines and electrical connections, to ensure that the trailer's brakes, lights, and other systems function properly. Releasing the reverse lock of the semitrailer is not a required step at this stage; the reverse lock is generally used only when maneuvering the trailer in reverse. By following these checks, you help ensure both your safety and the safety of other road users.