It is UPS policy to go inside and clear area and verbal inform you are hooking up! Never hit pin till you go inside and check !! But yrs ago we never did, and some pt'rs took the Axel Foley ride around the yard !! In some small buildings the primary sup works alone and calls me on the phone and clears trl,,,I trust him and have a long great repore with him,,,in other buildings they have young gun pt sups and I refuse to take their word and I go inside,,drives them nuts!!