Comparative experimental application of alternative travel diaries in Cape Town and Dar es salaam

Author(s): Behrens, Roger
All authors:
Behrens, R. and Masaoe, E.
Host organisation: CoE Cape Town, South Africa
Country: Kenya, South Africa, Tanzania, United Republic of
Publication year: 2009
Published in:
Proceedings of the 28th Southern African Transport Conference, Document Transformation Technologies.
Research theme: Management and Control, Mobility and Access
travel behaviour, Cape Town, Dar es Salaam, Nairobi
Conference proceedings
Internationally, travel diaries of various forms have served as the principal means of collecting revealed preference travel data. Household interview travel survey experiences in African cities, however, have demonstrated that the collection of travel diary data is problematic for both respondents and interviewers. This paper reports on the development of a travel diary instrument for use in a planned 24-hour recall home interview survey in Cape Town, Dar es Salaam and Nairobi. As part of the development of this survey instrument an experiment was undertaken to asses the appropriatness and feasibility of different travel diary formas. In other parts of the world travel diaries have taken thrree main forms: trip-based, activity-based and place-based diaries. Variations of these three basic diary forms include: the recording of trips in either tabular or sequentail question format; the prospective or retrospective request for respondent recall; and the use of memory joggers. The paper describes the impact of alternative travel diary forms on respondent burden, trip and trip stage recall rates, interviewer cognition and item recording errors. On the basis of the experiment findings, it is concluded that place-based diaries in sequential question format, with associated memory joggers, are likely to yield highest rates of trip recall and lowest rates of measurement error and item non-response in city contexts with respondent populations similar in socio-demographic nature to those in Cape Town adn dar es Salaam.
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