Coba jelasin Lihat pula dari Bundaran lalu lintas dong

Roundabouts: An Informational Guide  by the U.S. Federal Highway Administration, FHWA-RD-00-67, June 2000 (or see the entire pdf in one file)

Secion 3B.24 from the U.S. Manual on Uniform Traffic Control Devices

Roundabouts: Interim Requirements and Guidance by the New York State Department of Transportation, June 20, 2000

The Magic Roundabout of Swindon