Years ago I was taxiing a Cessna 170 across IAD. As I'm coming up to the place where the mobile lounges being used as interterminal shuttles cross the taxiway I slow down as one of these two story monsters is bearing down on us. The instructor in the right seat says, no you have the right of way, so I keep going. The owner of the plane happened to be in the rear seat and she reaches up and kicks on the the strobes. It was then the lounge driver sees us and slams on the break.. You could see people falling over through the lounge windows.