Sub-Dominant Stream : The traffic stream(s) or lane(s) at a multi-lane entry to a roundabout which has less flow than that of the 'dominant' lane at that entry. (i.e. any or all lanes other than the 'dominant' lane)
Peter Milne and Kieran Sharp, ARRB Group, and Bob Ungers, consultant, Austroads Glossary of Terms (4th Ed.), Austroads Ltd., Sydney, NSW, Australia 2010. http://www.bicyclensw.org.au/files/u1/Austroads_Gl ossary_of_Terms_4th_edition.pdf (Road Trfc and Transp Sfty - Brit) {529}