→Real-time current road speeds: minor wording changes
We can be confident that Waze uses real-time reports of current road speeds by preference over historical average road speeds. We know that Waze uses traffic congestion reports to reroute around slow traffic. Early versions of the client would also report when traffic speeds were good - this was removed due to map clutter. But Waze will still be receiving this information. We can assume that the speed of any wazer ahead of you on a stretch of road will be the speed used when your route is calculated.
As the number and density of
wazers grows this real-time data takes on a greater importance. This emphasis is partly a reflection of Waze's original goal to optimise commutes. As Waze has grown to be used as a more general purpose GPS navigation device over roads less travelled, the historical average road speeds becomes more important .
Waze knows the average speed of every confirmed road between you and your destination. The Waze server can calculate which list of roads to take to minimize the total travel time.