Supplements have provided important additional guidance to the Austroads Guide to Road Design (Guide). But there are questions about their use. Are these supplements needed? What should they contain? Should the information in the agency supplements be included in the Guide? These questions were addressed in a recently completed Austroads project that undertook a detailed review of jurisdictional supplements to the Guide. This webinar describes the classification of material in the jurisdictional supplements to establish guidance that could be moved into the Guide. The sessions focuses on a cross-jurisdictional platform for managing supplements within a jurisdiction and moving information from supplements to the Guide. The platform was developed with the input from the Project Control Group and the Road Design Task Force represented by Australian and New Zealand road agencies, and the Australian Local Government Association. The platform uses a ‘push-pull” approach where Austroads looks to ‘pull’ information from the supplements, and the road agencies look for a means to ‘push’ information into the Guide. This approach aims to assist in minimising supplement content and harmonising material in the Guide. The webinar was presented by Dr Rod Troutbeck, Dr Hafez Alavi, Mark Lenske and Phil Rosser.