The first two teleworking experiments in the Netherlands are described, and the results of an analysis of the impact of teleworking on the travel behaviour of the participants and their household members during the experiments are presented. The mobility evaluation was designed as a multiple panel with waves at approximately 3-month intervals. The two experiments were analysed and evaluated separately. Most important was the reduction of commuting trips (-15 percent) found in both experiments. The reduction is somewhat lower than expected on the basis of the percentage of time used for teleworking (18 to 24 percent) due to the freedom given in arranging teleworking time. The first experiment showed a considerable reduction of peak-hour automobile traffic (26 percent), which explains most of the commuting reduction; in the second experiment the reduction of commuting trips was due to fewer bicycle trips and public transport trips in the later waves. Car use was not influenced at all in the second experiment. A final important difference between the results was the lack of mobility effects for the household members in the second experiment. The first experiment indicated a surprising reduction of mobility not only for the teleworkers themselves but also for their household members. This result did not recur in the second experiment. Analysis of the dynamics of the process seems to indicate that a year may be too short a time span for monitoring such an experiment.
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