Federal Highway Administration

http://mutcd.fhwa.dot.gov/htm/2009/part2/fig2b_13_longdesc.htm

The Federal Highway Administration (FHWA) provides stewardship over the construction, maintenance and preservation of the Nation’s highways, bridges and tunnels. FHWA also conducts research and provides technical assistance to state and local agencies in an effort to improve safety, mobility, and livability, and to encourage innovation