>>149799299
> How often do bad crashes occur?
in the top level they are not that frequent, and being somebody hurt is even rarer (ofc smaller crashes like kissing a wall with the butt of the car or a ditch is more frequent but they usually not a cause for retirement)
In the lower tiers and leagues its more frequent but fortunately people rarely hurt

> What's the guy on the side telling him? Where to turn?
Distance to the next turn, how sharp is the next turn, anything to be aware (is the turn becomes tighter, dont cut, slippery, etc...) and things to look out like jumps, bigger stones or changing in surface
Before the rally the driver and codriver goes through the stages in road speeds and they make the pacenotes
You would think it might be not that important but frequent cause for crashes are too optimistic pacenotes
Also the codriver is the "brain" who is doing a lot of administrations between the stages (rallying is heavily dependent on that you have fixed times when you need to start the stages, check in to timing posts, etc) and looks out for everything going as it should, so the driver only needs to think about driving

there si a good primer on rallying on wrc's yt channel https://www.youtube.com/watch?v=_XQeec-c9k4