To help with an experiment that might allow more accurate mapping of the 6-lane segments, could someone pick just a few spots where 6-lane segments begin/end that are not at currently visible points and add hidden points of the form +6Lxxx at those places, and update `6lanetest.list` to use them for the affected route(s)? I'm trying a change that I hope will make this look accurate on the maps in Mapview and Showroute.