The Road and Traffic Authority (RTA)'s previous Project Justification Study comprised a traffic modelling and forecast study, a value management study (which was of a strategic nature), an urban design overview, design of alternative options and traffic impacts and safety studies. The Project Justification Study predicted future traffic growth flows on the Princes Highway and along the proposed Northern Distributor extension route. The Study recommended, amongst other things, that more detailed and up to date traffic surveys be undertaken to assist with the design and improve the basis for traffic predictions and modelling. ?The current Traffic Studies have been commissioned to build on the earlier Project Justification Report and should be read in conjunction with that work. This Traffic Study is intended to assist in the selection of the EIS Proposal for the new road, intersection treatments, parking demand and safety impacts.