Ken Wilshire gurgled happily, sounding much
like they were saying:

Speed cameras are a danger (except at real accident black spots) as it
is a reflex action to brake when you see one on a road not traveled
before, and you lose concentration checking that you are 'safe'.

Hmm. I'd have said that knowing what the limit is and knowing what speed
you are doing were fairly essential pre-requisites to being considered to
be driving in an attentive manner.

As the tolerances for speed cameras are not advertised, then it is
foolish to risk your license by driving past at any mph above the
posted limit.

ACPO's recommended +10%+2 notwithstanding...