The trafficable width of a road is equal to; (a) the seal width or surfaced width or; (b) in the case of a sealed road with edge lines the distance between the inside edges of the painted edge lines
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}