The mobility behaviour of people is often recorded in the form of travel logs. In these records, the respondents report on the trips they made on a given date either in writing or online via a questionnaire or verbally in the form of telephone interviews. The information collected typically includes arrival and departure times, journey length, journey purpose and the chosen mode of transport. The retrospectively recorded journeys can be highly inaccurate, as distances, for example, are only estimated. Given the high level of effort required from the participants in such surveys, the survey period is usually limited to one day or very short periods of time. Participants only report their journeys over a longer period of time in exceptional cases.
