I understand that the best way to alter the suggested route is to set an itinerary and add a waypoint (or a VIA if there is only one). My issue is that I want to alter the route by providing the intersection of two highways as a waypoint. When I select to travel by "Crossing or intersection" I see no way to select an interstate. All I see as options are roads. How does one tell TT that the crossing you'd like to travel by is say "I-71 and route 562"?