Answer:

RDS

Answer	Crossword Clue
RDS	Highway dept. concerns
RDS	Highways, abbr.
RDS	Hwys.

RDS	Aves.
RDS	Map abbrevs.
RDS	Abbey and others: Abbr.
RDS	Glory, Fury, and Revolutionary, for three, in movie titles: Abbr.
RDS	GPS display
RDS	Hwy. offshoots
RDS	--
RDS	Lines on a GPS

RDS	They intersect at a jct.
RDS	Hwy., blvd., etc.
RDS	Tobacco et al.: Abbr.
RDS	Rtes.
RDS	Ave. and st.
RDS	Ave. relatives
RDS	Map lines: Abbr.
RDS	Streets: Abbr.

RDS	Traveling turnoffs: Abbr.
RDS	Abbey et al.: Abbr.
RDS	Hwys., e.g.
RDS	Interstates, e.g.: Abbr.
RDS	Country rtes.
RDS	Fork sites: Abbr.
RDS	Some rtes.
RDS	Tobacco and Abbey: Abbr.

RDS	They may be dirt: Abbr.
RDS	Some may be dirt-covered: Abbr.
RDS	Ave. cousins
RDS	Ave. crossers
RDS	Some aves.
RDS	Abbey and Burma (abbr.)
RDS	Local map features (abbr.)
RDS	Tobacco, et al.? (abbr.)

RDS	Tobacco et al.? (abbr.)
RDS	Abbey, et al. (abbr.)
RDS	Abbey, et al.
RDS	Aves., sts., etc.
RDS	Urban routes (abbr.)