Self-reported and GPS-based mobility panels; what can they learn from each other?

In this study we present the results of a pilot study in which 360 respondents participated in a self-reported travel survey (the MPN), while being tracked in a GPS-panel (the NVP) at the same time. We compare both the aggregated outcomes of both panels as well as the individual trips. Results show that 9% more trips are recorded in the GPS-panel. The modal split is comparable, although the share of cycling is slightly higher in the NVP. To make comparisons on the trip level, the corresponding trips from the NVP and MPN need to be matched. We do so based on the departure time and postal code and are able to match approximately 60% of trips. When comparing these trips in terms of trip mode and travel purpose, some differences are observed. The differences are greater for trip purposes than for trip modes.