The only time I've seen a 0 car stop on stage was in Dyfnant on Rally GB a few years ago. Very tight hairpin on a narrow section at the end of a section where they've been flat for 550m. Three marshals stand on the outside of the hairpin, slightly off to the side, while all us speccies had put ourselves up an adjacent embankment. We could hear the 0 car nav shouting at them to move! They'd already been told to move by either the 00 or 000 (can't remember which)...

I've got a lot of time for marshals, always polite to them and try to chat, but we're all just enthusiasts there to watch a rally at the end of the day.