Red Clearance Lines
The Red Clearance Lines ignored by both the ground staff and flight crew.
The old airmanship calls have slowly been disappearing over the years.
For Example, "Clear Left --- Clear Right & all equipment behind the Line."
I also check and point out in Command training to check the aerobridges are parked in their painter circles indicating correctly retracted. AGNIS or similar electronic guidance doesn't sense the aerobridge positions before activating.