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Secret controls on PBP
Although, if you're not at the front of the race then you generally find out where the secret controls are if you just look at twitter.
I went off route on PBP twice and didn't retrace to fix it; once near St Nicholas-du-Pelem and again right near the finish (I followed the route out from StQeY). Tired brains do tired things.
They can award a time penalty but it's rare to actually get caught.
Secret controls on PBP