you need to either install TomTom maps on your phone and pay the subscription or grab one of their stand alone sat navs with lifetime free updates to maps and camera database, that way you get a gentle reminder if you're speeding on most roads and also get advance warning of any speed cameras and red light cameras as you approach them. I have never received a speeding ticket in 56 years of driving.
Can you please explain to me what legitimate use a red light camera warning system is. The only use case I can see is for scofflaws who want to deliberately run most red lights (endangering everybody in the process) and not get caught by the few traffic lights with enforcement cameras. There is no plausible explanation of how technology designed to subvert red light enforcement is going to contribute to road safety.
We've had the conversation about speed cameras before and I'll just reiterate my argument that if you're going to exceed the speed limit than you should be exercising enough attention and observation that spotting a speed camera well in advance is child's play by comparison. If you don't have the skill to do that then you shouldn't buy a chunk of electronics to allow you to speed with impunity. Better still, just don't speed.
I'm not going to utterly condemn something that reminds you what the speed limit is the way I do devices designed to subvert speed and red light enforcement cameras, but again, if your observation is so poor that you can't figure out the speed limit of the road you're on, then it's so poor that you'd fail a driving test, and thus really shouldn't be driving unsupervised until you've improved it.