I have been in Sonoma County for 3 months using Waze. Its route planner seems to only used time to determine routes, and sends me over roads with no signal lights at the next turn, blind corners at the turn, and rough roads with active repair work, roads in desperate need of repaving, etc, that save less than 5 minutes on my trip. It should chose routes with signals for left hand turns across highways, turns with no signal at blind corners, and avoid active roadwork. Saving 2 or 3 minutes isn't worth the risk of unprotected turns and potholed roads when there are better choices of well maintained roads less than half a mile away.