Accident trend monitoring and exploratory analysis. Final report.

National Highway Traffic Safety Administration, National Center for Statistics and Analysis, Washington, D.C.

Vehicle occupancy: report 6, 1977 - NPTS. Final report.

Federal Highway Administration, Highway Statistics Division, Washington, D.C.

Evaluation of emergency vehicle signal preemption on the Route 7 Virginia corridor.

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