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I stumbled upon this app after I was fined for speeding in an unfamiliar area when I completed missed the speed limit signs.
I'm not sure if it's available for Apple iOS, but it works really well on my Galaxy S4. Lately I've been using with with Google Maps as it just floats above the screen and announces changes in the speed limit, if your currently exceeding the limit, and if you're approaching any speed and red light cameras.
I've tried the Speed Alert Live but found this one was simpler and I could still use maps at the same time. I don't think it handles variable speed limits or road work zones, but apart from that, it seems pretty accurate.
https://play.google.com/store/apps/details?id=com.anthonykea…
thanks for sharing! my tomtom disappointing me sometimes. Doesn't pick up all the speed/red cameras and has incorrect speed limits.