Avoid stop signs! Sometimes is faster the paraller road, because it has a few stops signs!!
I know that waze finds the fastest route, but sometime that street has a lot of Stop signs, and the parallel street doesnt have any, so is faster!! Maybe for a future you could add the stop signs to the maps!! For you to take note: In Costa Rica there isn't 4 stop ways or 3 stop way, in an intersection, here there is always a road who has the way, and the other has the stop sign. Srry for my english, isnt my native language!!