Starting this thread mainly to bring forth a couple issues I've noticed with this system in DC. Given the lack of mileage showing up in the highway browser, I'm guessing this system is still in development.
First, on the Rock Creek Pkwy list, the southern endpoint should be labeled LinMemCir. There's an extra "c" in the draft version that's in TM.
Second, and impacting 3 of the 4 lists, is that the city quadrant is very prominent in DC signage, waymaking, and usage. Because of this, they should have been included. This doesn't affect the GW Pkwy list, but it does affect the other three. In the case of the Suitland Pkwy list, the western endpoint should be "SCapSt", as the South is very prominent in that streetname to distinguish it from North Capitol St and East Capitol St.
I'm guessing from the lack of their inclusion that Oscar did not draft these lists.
(EDIT) Also, for the Crystal City segment of the GW Pkwy, the southern terminus is actually at First St in Old Town Alexandria, not at Dangerfield Island. A waypoint should be added at Slaters Ln.