So, How Does It Work?
It’s easy. Upon encountering a road closure, just tap the closure icon in the report screen. Choose the type of closure (hazard, construction, or ‘event’) and mark how long you anticipate it’ll last. For extended closures, the map editing community will close the roads via the Waze map editor.
Once a road closure is properly reported, Waze will close off the road and route others around it.
Smart systems are also in place to ensure accuracy and predict reality. Waze will only close down a road once its algorithm has enough evidence to discount the possibility of error. Alternatively, once Waze detects cars driving on a closed off street, it will automatically return the road to its normal status and routing will resume as normal.
That's all we had "officially"