A portion of the carriageway adjoining through traffic lanes, used to separate either faster overtaking traffic or slower moving vehicles from through traffic, or for other purposes supplementary to through traffic movement
Local Government & Municipal, Glossary of Roads & Transport Terms, (LGAM) Knowledge Base (Encouraging Collaboration & Konowledge Sharing), Australia 2013. http://lgam.wikidot.com/glossary-of-roads-transpor t-terms/p/10, (Road Trfc and Transp Sfty - Brit) {603}