Final rulings, closing this out:
- Main Street does connect directly to the north end of MD 12, and this would otherwise make it worthy of inclusion - however it also forms part of the "interchange" between US13Bus and US50Bus, and as such "one point per interchange" says no.
- Random art museum is not significant enough to warrant points being added for the road that leads to it unless a user specifically needs them.
- That said, I did go ahead and throw an extra point on MD 350 at Airport Road, since it was a bit far between existing points for a developed area (over 8 miles). This junction both has some nominal significance (leads to an airport with commercial flights) and is near the middle of that gap.