Road Design

The focus of Part 4C is the detailed geometric design of the grade separations, ramps and ramp terminals associated with interchanges, particularly with respect to cross-section, design speed, sight distance, horizontal and vertical alignment, sight distance and the layouts of ramp terminals at the freeway and at the minor road. However, it also covers the needs of pedestrians and cyclists, and briefly covers some aspects relating to pavement markings, signs, landscaping and street furniture. However, to gain a thorough appreciation of these aspects designers should refer to the other relevant parts of the Guide to Road Design and to the Guide to Traffic Management – Part 6: Intersections, Interchanges and Crossings (Austroads 2007) which covers traffic management and road use aspects of interchange selection and design.