The application of HCM 2010 in the determination of capacity of traffic lanes at turbo roundabout entries

The main aim of this study was to verify whether it is possible to utilize the model contained in the HCM 2010 methodology for evaluation of traffic capacity of the lanes at the entries to turbo roundabouts in Poland. The models contained in the HCM 2010 methodology were compared with the empirical values obtained for traffic capacity of the traffic lanes at the entries to turbo roundabouts with values of traffic capacity determined based on the author's own models developed based on the data collected at turbo roundabouts located in Poland. The comparison demonstrated a moderate consistency of the compared values of traffic capacity.