Like New Judge I mainly rely on the view through the windscreen, but I use Waze for traffic info and warning of hazards and the like. At least in my local area I've found it is generally quite quick to incorporate any changes to Road layouts, speed limits etc.
A little while ago it also started flashing up warnings when approaching a large reduction in speed limit (e.g. NSL -> 30mph), which might help some people avoid abrupt braking.