Rally drivers' helmets

[SamHH]

Why do so many rally drivers wear open face helmets? From what I've seen, most competitors in closed top circuit racing cars wear full face helmets, so why do rally drivers risk a smack in the face? The only thing I could think of is that rally drivers need a wider field of vision but wouldn't a motorcycle-style wide visor provide that?

[SamHH]

k50 del said:

As a co-driver, an open face helmet is pretty much a must, as it's nearly impossible to look down at the notes with a full face one on.

Hadn't thought of that.