What should be the first thing that Gerry should do before uncoupling?

Explanation: • Remove the registration number plate from the semi-trailer: No, this is not important at this stage and is not a safety issue.
• Drop the legs on the semi-trailer: No, unless the trailer is secured, winding down the landing legs could cause it to move.
• Unclip the dog chain and pull the trailer release handle: No, the semi-trailer must be secured before it is released from the tractor unit.
• Apply the trailer brake: Yes, ensure that the trailer cannot move anywhere if something does go wrong.

Category: CPC Case Studies: Vehicle Loading Unloading and Security