(Note: This article assumes right-side driving. For left-side driving, swap left and right accordingly.)

Some left-turn zones may allow additional movements, e.g., thru. This can be common in small intersections with few total lanes. The GRIDSMART Client does not allow permissive phases to be set for multi-movement zones. In this case, you should specify all movements for that zone to be protected with their corresponding phase. For example, a combined left-thru zone might have protected thru movement with phase 8 and permissive left turning with phase 3. In that scenario, you would assign both phases 8 and 3 as protected for that zone.