Potential means of cost reduction in grade crossings motorist-warning control equipment. Volume II: comparison of solid state and relay devices and techniques. Final report.

Transportation Systems Center, Cambridge, Mass.

Evaluation of traffic control devices for rural high-speed maintenance work zones.

Texas Department of Transportation, Research and Technology Transfer Office, Austin

Driver understanding of work zone flagger signals and signaling devices. Interim report.

Texas State Department of Highways and Public Transportation, Transportation Planning Division, Austin

Executive summary and abstract for the report entitled "An evaluation of warning and regulatory signs for curves on rural roads."".

Federal Highway Administration, Office of Research, Washington, D.C.

Driver response in active advanced warning signs at high-speed signalized intersections. Final report.

Federal Highway Administration, Washington, D.C.

Emergency vehicle warning systems /

"Issued May 1981."