The Transport and Population Data Centre (TPDC) has been running the Sydney Household Travel Survey (HTS) as a continuous survey since 1997/8. It collects information on day-today travel in the Greater Sydney Metropolitan Region including Newcastle, Wollongong and the Blue Mountains. Using this data collection method, the full response rate (all members in the household participated) and part response rate are currently about 55 per cent and 8 per cent respectively out of a net sample of approximately 4,800 households annually. In line with the trend in Sydney and internationally, the response rate has, however, declined significantly over the years since 1981 when the Sydney Household Travel Survey achieved a response rate of about 79 per cent and even since the first wave of the current survey when the overall rates were still around 76 per cent. This paper examines the issue of decreasing response rates and sets out to find if using mixed methods of data collection would produce better trip estimates and would b more cost effective. (a) For the covering entry of this conference, please see ITRD abstract no. E213716.
Samenvatting