Development of Edition 4.0 of the Guide to Road Design Part 6: Roadside Design, Safety and Barriers

This research report documents changes to Edition 3.2 of the Austroads Guide to Road Design Part 6: Roadside Design, Safety and Barriers, and in particular, Sections 4, 5 and 6. This research report also provides background information to the guidance and commentary which informs the reader on aspects of the Guide. The topics covered include the flexibility of barriers, working width, a barrier's points of redirection, the offset of barriers from kerbs, the length of need, the classification of MASH soils to support safety barrier installations, the orientation of barriers on superelevated roads, barrier selection guidance, aesthetic road safety barriers and the performance of frangible poles and masts. The report is available from the Austroads web site at https://austroads.com.au/publications/road-design/ap-r670-22