In the United States, a downtown circulator is a road, bus or tram system to distribute traffic or people through a downtown area.

Examples include:

• Miami, Florida's Downtown Distributor
• Pawtucket, Rhode Island's Downtown Circulator
• The DC Circulator bus system in Washington, D.C.
• Tulsa, Oklahoma's Inner Dispersal Loop formed by I-444 (Unsigned) and I-244.
• Kansas City, Missouri's downtown freeway loop
• Molly the Trolley of Trinity Metro in downtown Fort Worth.^[1] One everyday line and one lunch weekday line.
• Lymmo of LYNX (Central Florida Regional Transportation Authority) in Orlando.^[2] Four lines.
• Music City Circuit of WeGo of Nashville.^[3] Two free lines.

A circulator bus is a bus serving an area confined to a specific locale, such as a downtown area (downtown circulator) or suburban neighborhood, with connections to major traffic corridors.^[4]

• Ring road