The Waze satnav does stuff i ve never seen before. It communicates live traffic info, so if there is congestion, it redirects you around it.
But this one got to me. On the motorway, it warns you that a car is broken down on the hard shoulder a mile before you get there. That is something i,ve never seen a satnav accomplish.
Likewise Googlemaps warns you when a mobile speed camera van is ahead. That is surprising as there are 8 locations they use, but the live feed tells you which location the van is parked.
Most of what you experience with Waze is actually put on to it by other people using Waze. If you see a notification for a car on the hard shoulder it has been added to the system by other wazers, the same as roadworks and police.