There are a bunch of boolean flags (or other single byte values) for each spline that I mostly don't understand. I don't have any hint for their meaning, and all I can do is to look on the map for context and try to draw some conclusions.There is a flag probably indicating that the section is a road with traffic in opposite directions (as not a road with some/any divider between the lines, even on local roads). There is a flag for parking lots (and only local parking lot routes, not just roads with parking spaces on sides).There is a value indicating whether a path is an off-ramp, or an on-ramp, like this:There is a flag active mostly for non-highway roads, and two flags active mostly for highways and highway ramps, that I'm not sure about their specific meaning. Here is an example (green when one flag active, blue when second flag active):There are three more flags activated in patterns so random, that I don't even know where to start.