Abstract
Real-time information on how a road network performs is useful to a road manager and a road user. A road manager makes use of the information to manage congestion, e.g. balancing congestion in different parts of a rod network. A road user can also benefit from the same travel information to avoid congestion by re-routing or varying trip start times. Travel times are now displayed on most freeways in many cities in real time. The estimation of arterial travel times is a more challenging task because arterials are interrupted facilities with signals and other control devices interrupting traffic flow. This paper describes the ARRB Travel Time Model for estimating arterial travel times for general traffic and buses. The model retrieves traffic data from the signal control system, SCATS, each minute and has been implemented since May 2006. This paper describes the calibration and validation processes and highlights challenges for estimating travel times without identifying individual vehicles.
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