http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Yellow bar markings on motorway slip-roads
Transport Research Laboratory (Great Britain)
Includes bibliographical references (page 23).
Crowthorne, Berkshire : Transport Research Laboratory, [1993]
Project report (Transport Research Laboratory (Great Britain)) ; 49