Should the point at MO151/156 be moved to the curve? And based on the signage, the point at MO15, MO151, and MO156 should probably be split. (Signage on MO15 makes it appear that MO151 continues to MO15, but signage on MO151 and 156 indicate that MO151 ends at MO156.)
MO 15: Move point to curve.
MO 151: Rename MO15/156 to MO156.
MO 156: Add point for new MO 15 intersection. Rename MO15/151 to MO151.
Also, point OldUS36 on MO151 should probably be renamed US36Bus.