Austroads Publications Online
Guide to Road Design Part 4A: Unsignalised and Signalised Intersections (2017 Edition)
Publication no: AGRD04A-17 Pages: 142
Published: 07 June 2017
Guide to Road Design Part 4A: Unsignalised and Signalised Intersections provides road designers and other practitioners with guidance on the detailed geometric design of all at‑grade intersections (excluding roundabouts).
This Part contains information for the design of signalised and unsignalised intersections. Guidance is provided on intersection sight distances, including approach sight distance, safe intersection sight distance, and minimum gap sight distance. Left and right turn treatments are outlined including the incorporation of auxiliary lanes at intersections and the use and size of traffic islands.
This third edition contains minor editorial and technical changes throughout the Guide, and substantial parts of Sections 1.4, 3.2, 4.3-4.14, 5.1, 5.2, 6.1, 7.1-7.5, 8, 9 and 10 have been transferred to Guide to Road Design Part 4: Intersections and Crossings – General.
Updates have been made throughout this edition to include new and updated reference material and cross‑references to other Guides. Most figures have been redrawn to provide a consistent appearance. The major updates include:
Table of ContentsSummary
This website is operated by CanPrint Communications on behalf of Austroads. If you have any questions, please use the feedback form or call us on 1300 889 873, between 8:00 am and 5:00 pm AEST. If you are outside Australia please call us on +61 2 6293 8381.