VARIABILITY OF INDIVIDUAL TRAVEL TIME COMPONENTS

Each of the separate components of journey time is examined for a variety of travel modes (both public and private) between a single origin and destination pair. The components of travel time considered for variability include, for each mode, walk times, wait times, in-vehicle time, and transfer times. The mean travel time is shown to be strongly dependent on departure time. The log-normal distribution proves a useful, general descriptor of in-vehicle times. Individual components of travel time on any particular journey are found not to be significantly correlated to one another.