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Citizens For Modern Transit

East-West Gateway Council of Governments (metropolitan planning organization)

  - Link to all local municipalities and counties in the St. Louis Metro Region

Gateway Trailnet

Gateway Vehicle Inspection Program (emission and safety certification program)

Illinois Department of Transportation
  - Illinois Highway Construction Map

Interstate Highway 50th Anniversary Site

Jefferson County Public Works (highways division)

Lambert St. Louis International Airport

Madison County Transit (regional mass transit authority in IL)

Metro / MetroLink / MetroBus (regional mass transit authority in MO)
 

Missouri Department of Homeland Security

Missouri Department of Revenue - Drivers License and Vehicle License Information

Missouri Department of Tourism

Missouri State Highway Patrol

Regional Bikeways of Metro St. Louis Map (provided by RideFinders)

RideFinders (regional car pool agency)

St. Charles County Highway Department

St. Louis City Government Pages

St. Louis City Street Department
    
St. Louis County Department of Highways and Traffic

St. Louis Regional Clean Air Partnership

Savemolives.com - Missouri Coalition for Roadway Safety

Transportation Engineering Association of Metropolitan St. Louis

Transportation Security Agency