Road Design Considerations for Intersections Main Roads has no supplementary comments for this section.
That is not to suggest that roundabouts are the most appropriate traffic solution in all situations, but the research should alert Designers to social and environmental benefits that they might not otherwise be aware of when choosing an intersection type. For larger intersections, the difference becomes more noticeable. The findings confirm that, in general, emissions generated at roundabouts are lower than for signalised intersections catering for similar traffic volumes. Main Roads has undertaken research on a range of traffic scenarios and modelled the emissions emanating from an intersection with roundabout control in comparison with an intersection under traffic signal control. Main Roads is aware of the concerns of the community regarding the level of carbon emissions emanating from stationary traffic and the subsequent impact on the environment. These are outlined in the Austroads Guide to Traffic Management, Part 6, Intersections, Interchanges and Crossings (2017). A range of factors should be taken into consideration when deciding the most appropriate traffic management treatment at any given intersection or crossing. It is important for Road Planners and Designers to be aware of the effects that different types of intersection control may have on delays to traffic (under various traffic demand situations) and the resultant emissions. Figures and tables in this Supplement replace those with the same figure or table number in the equivalent Austroads Guide. This Supplement has the same structure as the equivalent Austroads Guide and only additional requirements, clarifications, or practices different from Austroads appear. Where appropriate, this Supplement may also contain additional sections and figures not covered by Austroads, but the numbering sequence found in the Austroads Guide remains. In Western Australia, Main Roads' policies, guidelines and standards take precedence over Austroads Guides and Standards Australia Standards. National Guides and Standards take precedence over International Guides and Standards, unless specifically stated otherwise.
This Supplement has been developed to be read as a supplement to the Austroads Guide to Road Design (GRD) Part 4: Intersections and Crossings - General (2017), a copy of which can be obtained via the Austroads website.
Appendix F - Derivation of Sight Distance Requirements at Railway Crossings.Appendix D - Crash Types at Unsignalised Intersections.
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