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Dad was stopped by a roadside patrol suggesting he was exceeding the speed limit. He questioned the speed, they said it was 'Clearly marked on a sign back up the road' and again, Dad questioned it.
They both walked back up the road to where the sign was and it was completely obscured with dirt and grime.
The Policeman told Dad he could go about his business and he did so, leaving the Policemen trying to clean the sign with his hanky. ;-)
But I agree with you, when driving unfamiliar roads, it's quite good to have the GPS remind you that you are over the speed limit, even if only by 1mph.
Cheers, T i m