I totallt agree with you. A couloured warning AFTER the hazard is as much use as a chocolate teapot! This issue has been discussed on here before but other users on this forum said it was not a problem for them. At the time I assumed it was a problem with the data for my home country (New Zealand) but right now i am travelling in Western Europe and both my high-end Android phone and my wince motorcycle device show exactly the same problem. It is posssible to change how far ahead the (grey) warning appears but the coloured warning is ALWAYS after the hazard is passed

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