Hardly Speed cameras tend to not influence traffic deaths but are in areas where revenue can be produced; even if drivers are safely traveling.
Oddly enough, I've never seen one in a school zone when the limit is reduced; a place where strict enforcement is warranted for safety.
And set reasonable speed limits. Don't drop from 45 to 25 at once, as some jurisdictions do and have a cop waiting near by. And you realize radar picks the strongest signal, not necessarily the closest one.
Personally, I like the laser gun speed detectors because they require a cop to identify a target and lock in, leaving much less room for errors.
If you're keeping up with traffic you may be doing 5 - 10 over in many areas and respecting the driversd around you.
As for red lights, be sure the yellow is long enough for a vehicle to safely make it through without it going red quickly to generate revenue and cause accidents.
Here's an interesting read:
Yellow Light Timing
There could be any number of reasons the ticket isn't valid, for example a lack of calibration of the radar unit to bad timing of the light. So let me go to court to fight it rather than it be an administrative hearing run by someone that is not a judge, and may be an employee of the company that gets a cut of the revenue.
It is not unusual to pick up a few mph going down a grade and wind up 4 -5 over before you brake. Some jurisdictions have laws that do not allow ticketing for less than x over within Y distance of a Z grade for that reason.
This isn't about doing 90 in a 60 zone or driving recklessly, it's about what does a reasonable and prudent driver drive at and not using technology simply to enhance revenue in the name of "safety." If you don't think that happens, do some Google searches.