Why do lorries park with their rear doors open?

Posted by Two_Flower_Nix@reddit | AskUK | View on Reddit | 60 comments

I’d guessed that lorry drivers would park for the night with their trailer doors open to show they had no contents.

However, I’ve just seen a lorry parked up with its rear doors open, but it looked to have things inside.

So my question is: Does anyone know why lorry drivers leave their rear doors open when parked for long periods?