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- United States. Federal Highway Administration✖[remove]129
- American Association of State Highway and Transportation Officials27
- National Cooperative Highway Research Program27
- National Research Council (U.S.). Transportation Research Board25
- United States20
- American Association of State Highway Officials17
- National Research Council (U.S.). Highway Research Board9
- De Leuw, Cather & Company3
- Society of Photo-optical Instrumentation Engineers3
- United States. Department of Transportation3
- Advanced Asphalt Technologies, LLC2
- Aktan, A. E.2
- Arthur D. Little, Inc2
- Chase, Steve (Steve B.)2
- Cunningham, Roger A.2
- Israelsen, C. E.2
- Kittelson & Associates2
- Richardson, David L.2
- Robinson, Bruce W.2
- SPIE Conference on Health Monitoring of Highway Transportation Infrastructure (2001 : Newport Beach, Calif.)2