  The objective of this paper is to study the effect of travel time information
on day-to-day driver route choice behavior. A real-world experimental study is
designed to have participants repeatedly choose between two alternative routes
for five origin-destination pairs over multiple days after providing them with
dynamically updated travel time information (average travel time and travel
time variability). The results demonstrate that historical travel time
information enhances behavioral rationality by 10\% on average and reduces
inertial tendencies to increase risk seeking in the gain domain. Furthermore,
expected travel time information is demonstrated to be more effective than
travel time variability information in enhancing rational behavior when drivers
have limited experiences. After drivers gain sufficient knowledge of routes,
however, the difference in behavior associated with the two information types
becomes insignificant. The results also demonstrate that, when drivers lack
experience, the faster less reliable route is more attractive than the slower
more reliable route. However, with cumulative experiences, drivers become more
willing to take the more reliable route given that they are reluctant to become
risk seekers once experience is gained. Furthermore, the effect of information
on driver behavior differs significantly by participant and trip, which is, to
a large extent, dependent on personal traits and trip characteristics.
