If you’re designing a pavement structure based on the AASHTO Guide For the Design of Pavement Structures (1993), then you wouldn’t include anything other than trucks (semi-trailers, single-units, and buses) because passenger vehicles produce negligible wear. Even the devil’s own ride, the Ford F-250, produces 1/1350th the wear of one loaded semi-trailer.

Given this is D.C., I would assume this is just a manifestation of petty malice toward symbols their council associates with people on the “wrong” side of righteous causes.