• St. Louis County Government
• St. Louis County Department of Highways & Traffic
• City of Brentwood
• City of Clayton
• City of Maplewood
• City of Richmond Heights
• Missouri Department of Transportation
• The New I-64
• Gateway Guide
• East-West Gateway Council of Governments
• Metro St. Louis
• Additional Information on Median U-Turn Intersections
  from Michigan Department of Transportation
• Synthesis of the Median U-Turn Intersection Treatment, Safety, and Operational Benefits by the U.S. Department of Transportation