It's really fun when 3 or 4 people all know and do the same thing. It solve the 'weak point' and once or twice I've been part of a 'team' that cleared a jam that way. It's a weird sort of rush.
Thanks for the link. I believe it was this episode that influenced a lot of how I drive (merging, staying slow but consistent in stop-and-go traffic, &c). It should be required watching for new drivers.