Road-Friendly Suspension : A suspension system which has a natural frequency less than 2 Hz and a minimum damping ratio of 0.2, with at least half of the damping generated by hydraulic shock absorbers
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}