The Highway Capacity Manual (HCM 2010) is used in Spain to analyze traffic operation and quality of service. The effect of passing in two-lane highways is considered through adjustment factors to the average speed and the percent time spent following. They depend on the percentage of no passing zones and were calibrated with traffic simulations based on field data from the 70’s. The objective of this research is to evaluate the performance measures in two-lane highways considering the distribution of passing zones. TWOPAS was calibrated and validated with field data. For the calibration, genetic algorithms were used. Then, the model was applied to an ideal two-lane highway varying the traffic flow and the passing zone distribution. More than 85.000 scenarios were simulated. The percentage of no passing zones was not enough to explain the effect of passing maneuvers in the performance measures; so, the length of the passing zones should also be considered     «

The Highway Capacity Manual (HCM 2010) is used in Spain to analyze traffic operation and quality of service. The effect of passing in two-lane highways is considered through adjustment factors to the average speed and the percent time spent following. They depend on the percentage of no passing zones and were calibrated with traffic simulations based on field data from the 70’s. The objective of this research is to evaluate the performance measures in two-lane highways con...     »