Jeanne,
That sounds a little backwards...A crash in turn 2 would have a waving yellow in turn 2 and a standing yellow in turn 1 if the turn 2 captain asked for it.
At least that's how we do it at Summit with MARRC. We don't require upstream stations show a support flag unless the captain where the incident is requests it.
Alot of times , at SP, this occours in Turn 5 when the captain will ask the flagger at 4 for a standing yellow.
Will