Waze needs an "Always Avoid This Intersection" feature.
Waze consistently routes me to turn left at a traffic light at an intersection that has 6 lanes of traffic merging into a single lane to get on to a freeway which is also controlled by a traffic light. The congestion there is ALWAYS terrible and easily adds 20 minutes to my commute. Users with local knowledge should be able to specify intersections to avoid at all times. This "avoid list" would be user specific, thereby allowing each user to maintain it (add/delete intersections) as necessary.