Another possibility
Another possibility is that pre-sorting must take place earlier for a certain intersection. In the example below, you must already pre-sort at the first traffic light (VRI1) in order to turn left - in particular - at VRI2. Must be, because arrows on the road are a mandatory driving direction. It is therefore not only pleasant, but also necessary to show the correct LG in Waze at VRI1. This cannot be solved with heuristics. In any case, the distance is too great; the segment between VRI1 and VRI2 is 75 m long. Moreover, heuristics are already applied at the intersection at VRI2, and this cannot be done twice in a row.
So FL must be set. Since the VRIs are also linked together here, FL1 using a JB is the correct solution. In addition, the JB is used to prohibit U-turns at the ⋕ intersection.