Abstract
The work presented in this paper originates from the research conducted within the CIVITAS ELAN project, co-funded by the European Union. One of the main project objectives was to improve the quality of public transport (PT) service in the city of Zagreb. For the purpose of evaluating the impact of the project, it was necessary to analyze and evaluate the tramway network performances with high level of detail. Owing to this requirement, four probe vehicles (trams) and GPS (Global Positioning System) vehicle tracking technique was used to collect the traffic data which enabled accurate calculation of operational performances of the network. The selected technique made the evaluation possible on micro and macro level. Apart from presenting the evaluation results, the paper outlines several case specific disadvantages of GPS probe vehicle technique. The two main ones were a mismatch between geographical locations of the control points and actual tram position recorded by GPS receiver and inability to distinguish dwell time and intersection delay if the PT stop is located directly in front of signalized intersection. This knowledge can be useful for future research endeavors in this field.
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