during heavy traffic jam, driver hit the gas & stop again, the traffic condition remain not smoothly for very long period.
can waze pop up a message to driver, drive slow to 20km/h(or some specific detected speed ) to keep distance with front car & change to slow lane. and who accept this get the reward.

and always pop up a mesage teaching driver don't cruise at the fast lane, give way to other & collect reward when they accept

of course if gps can really detect the driver who really change lane, the reward ranked are much valuable

also always pop up mesaage teach driver smooth drive tips