The former Roads and Traffic Authority (RTA) published its Guide to Traffic Generating Developments ('Guide') in the mid-1990s. This document drew on the results of a number of trip generation and parking demand surveys covering a range of land uses. These surveys had been progressively conducted since 1978. The trip generation and parking requirement data in the Guide is becoming increasingly out-of-date. Several new business types are not adequately represented and there is evidence of ongoing industry rationalisation (eg larger medical centres, evolving medical practices, etc). There is increasing awareness that public transport has not been adequately accounted for in previous trip and parking generation surveys. TEF Consulting (The Consultant) was appointed to undertake a detailed trip generation analysis of medical centres. The study includes surveys of traffic characteristics relating to vehicle and person trips at 14 medical centres in the Greater Metropolitan Sydney area, and 6 medical centres in the Regional NSW areas.