I have exactly that problem. They are letter of the law, not spirit of the law.
There is one near me by a school. 30mph.
If I go through there at 35mph at 2am on a clear dry night, I will get a ticket.
If someone goes through there at school kick out time at 29mph in the pouring rain they won't.
Who is most likely to hurt someone?
Then again, what am I thinking... Who's got a hope of doing anything like 29mph at school kick out time... But that's a different rant!
Another camera near me had an interesting effect on accident stats. Yes it did reduce the number of injuries (shifted them down the road 500 yards I'm sure), but curiously it doubled (from 1 to 2) the number of fatalities. They didn't mention that statistic... Yeah, I know, lies, damn lies etc.