Sign legibility for modified messages. Final report.

Virginia Department of Transportation, Richmond

Visibility requirements of work zone traffic control devices. Final report.

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

Retroreflective requirements for traffic signs - a STOP case study. Final report.

Mode of access: Internet.

Optimal placement of reflective pavement markers. Final report.

Ohio Department of Transportation, Columbus

Minimal luminance requirement for official highway signs. Final report.

Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.

Legibility and driver response to selected land and road closure barricades. Final report.

Mode of access: Internet.

A comparison of lighting, signing, and pavement marking methods for detecting rural intersections at night. Final report.

Ohio Department of Transportation, Columbus

Minimum retroreflectivity requirements for traffic signs: summary report.

Mode of access: Internet.

Center barrier visibility study. Final report.

Federal Highway Administration, Washington, D.C.

Follow-up study: floating glass beads for traffic stripes. Final report.

Mode of access: Internet.