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I don’t know how it works in America, but in Germany and presumably most parts of Europe, red light cameras are triggered by coils under the road (similar to speed cameras). There’s usually one coil right past the stopping line (for cars being halfway over) and another coil somewhere closer to the center of the intersection (for fully running a red light).
If you care to minimize Standby power “comfortably”, usually libraries or power companies will let you borrow an AC Power Meter free of charge.
You can use that to inspect your various devices Standby Power. For example I have an amplifier that pulls nearly 15W in standby, since finding out it lives on a smart plug.
However my TV pulls less than 1W, and at that point I prefer the convenience of just being able to use the remote to turn it on.
(Also keep in mind with the smart plug solution that the plug itself will pull a little bit of power too, this will pretty much always be <1W though.)