> Wikipedia says all LEO or military authorized to assist the convoy are given a countersign. This is to prevent tricking into a roadblock like you suggest. I

> Wikipedia says all LEO or military authorized to assist the convoy are given a countersign. This is to prevent tricking into a roadblock like you suggest. I wasn't suggesting anything in particular, but I think the sort of roadblock you'd use to slow down a convoy like this would involve a staged accident to force a detour of the convoy to a less secure route. An awful lot needs to go wrong for that to even be possible, and at the end of the day there's still combat with heavily armed law enforcement needed to get near the cargo. It seems pretty futile, since the end result of applying even an overwhelming (and somehow previously undetected) force to the convoy is probably going to be a ruined road, a ruined semi, and a difficult to open, boobytrapped vault on the road that weighs so much you'd need a crane to move it.