• Aircraft Owners and Pilots Association

• Airports Council International

• American Association of State Highway and Transportation Officials

• American Public Transit Association

• Community Transportation Association

• Institute of Traffic Engineers

• International Business Development Network

• International Road Federation

• National Association of Railroad Passengers

• National Motorists Association

• National Safety Council

• National Transportation Safety Board

• Road Construction Network

• Safer — Browseable databases of public information about carriers' safety records

• The Road Information Program (TRIP)

• Urban Transportation Monitor

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