Something a simple as a Google Earth .kml file would work, although that obviously has limitations. I’d be happy to make one if there aren’t others out there who have better solutions.
may I submit the three hills (two of which being fly-overs) on the MVT between the GW Parkway entrance ramp trail crossing at the south side of Reagan National and the chain link fences at the north side of Reagan, be known as The Three Bears.
(so it’s not just me and my wife that call them that)