gettingthere wrote:FWIW, someone at the Waze meetup in Palo Alto asked if Waze had logic in the routing server to deal with intersections and the difference between straight through and left turns. Waze stated, yes.
That was me, and the full answer was along the lines of "transit through a junction time" was calculated by considering the current segment, junction, and destination segment. IOW the junction stores transit time for each "turn" direction like a segment stores transit time for its directions, presumably live and historical.
For signaled turns your "transit through a junction" time for a turn would be much higher than going through the intersection. This can result in some odd routes where the most direct route is not selected because it has a long wait for a signaled turn vs going to the next intersection. This is especially noticed at lighted intersections that switch to a timed sequence vs demand sequence in the late evening.