Twin Steer Axle Group : A group of two axles with single tyres fitted to a motor vehicle and connected to the same steering mechanism; the horizontal distance between the centrelines is at least 1 m, but not more than 2 m
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}