Do you have a smartphone? Download the WAZE app. It lists all the photo radar and red light cameras in the city. Plus, users can flag Cops if they're stopped anywhere as they have the potential to be operating radar.
As for speed limits, if they were truly interested in safety, they'd adopt a policy used in US states. They have two speed limits in school zones and they're punctuated by flashing amber lights during school hours. Fines are also doubled when lights are flashing. In other words, during school hours, the speed is reduced and the fines are doubled. It also means that in off school hours and summer months, speed limits aren't reduced.
Photo radar is a speed tax. The fine goes to the owner of the vehicle (who might not even have been driving), there's no points and it doesn't affect your insurance rates.