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Waze used to indicate transient road hazards (e.g. stopped cars, pot holes). It's in Google Maps now too (took them long enough) and I assume others.

Static hazards deserve physical signage and/or remediation.

As I mentioned in another comment, Waze does this. There's a stretch of the Capital Beltway that, if it was on a race track and compressed, would be called "esses." It's totally fine to navigate at 80 MPH with no drama in any mechanically sound, post-1980 car, but it catches mediocre drivers by surprise. Waze throws up a "history of accidents" message whenever I drive through it.

Me too, that's a great idea. Or just incorporated into the satnav, better than getting the warning for an upcoming speed camera.