Table of Contents

1.1 Purpose

The Austroads Guide to Road Design seeks to capture the contemporary road design practice of member organisations (refer to the Austroads Guide to Road Design Part 1: Introduction to Road Design (Austroads 2015a)). In doing so, it provides valuable guidance to designers on the production of safe, economical and efficient road designs.

The purpose of this guide is to provide the information necessary to enable designers to develop safe and coordinated road alignments that cater for the traffic demand at the chosen speed. This guide also presents information leading to the choice of appropriate cross‑section standards, which will enable designers to balance the needs of all road users and the environment in which the road is constructed.

For guidance on the design of unsealed roads, designers should refer to the ARRB Unsealed Roads Manual: Guidelines to Good Practice (Giummarra 2009).

Figure 1.1: Flowchart outlining the Guide to Road Design

As shown in Figure 1.1, Part 3 is one of eight guides that comprise the Austroads Guide to Road Design and provides information on a range of disciplines including intersection design, drainage, roadside design and geotechnical design, all of which may influence the location and design of a road. Outputs from the geometric design process must be considered in the broader context of the overall design task as they may impact on other elements of the design. Whilst Figure 1.1 outlines the structure of the Guide to Road Design, designers should be aware that there are nine other subject areas spanning the range of Austroads publications that may also be relevant to geometric road design (