Gradient 08 : The longitudinal slope of a road or path, usually represented as the ratio of a one metre rise to the horizontal distance (e.g. I : 50), or expressed as a percentage (e.g. 2%)
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}