Local
- Breathe Utah
- Crossroads Urban Center
- Disabled Rights Action Committee
- FRIENDS of Great Salt Lake
- Great Salt Lake Audubon
- League of Women Voters of Utah
- Sierra Club Utah Chapter
- Utah Department of Environmental Quality
- Utah Department of Transportation (UDOT)
- Utah Division of Air Quality
- Utah Moms for Clean Air
- Utah Physicians for a Healthy Environment
- Utah Rivers Council
- Utah Transit Authority
National
- Amtrak
- Coalition for Sustainable Transportation
- Environmental Defense Fund
- Environmental Protection Agency
- Hawkwatch International
- Houston Tomorrow
- League of American Bicyclists
- National Association of Railroad Passengers
- Reconnecting America—Center for Transit-Oriented Development
- Smart Growth America
- Smart Growth Online
- Surface Transportation Policy Partnership
- U.S. Conference of Mayors
- Victoria Transportation Policy Institute