Hey thanks for the message. Glad I'm not the only one who cares about highway classifications.

So my reasoning for changing that section from trunk to primary was because the nature of road itself changes drastically at the DC line—from a sidewalked, 4 lane road with bus stops, residences, etc—to a high-speed, 6-lane divided highway with no pedestrian access. E.g. you can walk from the Capitol to Southern but no further.

Grading the DC and Maryland sections as the same did not, to me, reflect my visual observations on the ground. Even if a lot of commuters use it, it just didn't seem to match the road itself if that makes sense.

I didn't really think of it as "breaking" the trunk, just clarifying that the function of the road changes as it enters the city.