A quick search on google came up with this
Criteria for mobile enforcement sites:
Number of fatal & serious collisions - At least 2 per Km in last three calendar years (not per annum)
Number of personal injury collisions - At least 4 per Km in last three calendar years
And today a camera van has been parked on the verge of our towns bypass. A road that had only been opened 24 hours previous. Officially can they actually be there or not? I'm not worried I was caught (was stuck behind a tractor).
Criteria for mobile enforcement sites:
Number of fatal & serious collisions - At least 2 per Km in last three calendar years (not per annum)
Number of personal injury collisions - At least 4 per Km in last three calendar years
And today a camera van has been parked on the verge of our towns bypass. A road that had only been opened 24 hours previous. Officially can they actually be there or not? I'm not worried I was caught (was stuck behind a tractor).