Il y a divers manuels en des anglais:
FHWA: Roundabouts: An Informational Guide
http://www.tfhrc.gov/safety/00068.htm
Kansas DOT: Roundabout Guide
http://www.ksdot.org:9080/burtrafficeng/Roundabouts/Roundabout_Guide/RoundaboutGuide.asp
PennDOT (FTP): Guide to roundabouts (entre autrui)
ftp://ftp.dot.state.pa.us/public/Bureaus/design/PUB414/
NCHRP: Roundabouts in the United States
http://144.171.11.107/Main/Public/Blurbs/158299.aspx
Bonne lecture