Modification of the Highway Capacity Manual two‐lane highway analysis procedure for Spanish conditions |
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| Authors: | Ana T. Moreno Carlos Llorca Scott S. Washburn José E. Bessa David K. Hale Alfredo Garcia |
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| Affiliation: | 1. Department of Civil, Geo and Environmental Engineering, Technical University of Munich, Munich, Germany;2. Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL, U.S.A.;3. Federal Center for Technological Education of Minas Gerais, Belo Horizonte, Brazil;4. Leidos, Inc., Reston, VA, U.S.A.;5. HERG, Universitat Politècnica de València, Valencia, Spain |
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| Abstract: | The US Highway Capacity Manual (HCM) methodology is used in Spain to evaluate traffic operation and quality of service. The effect of passing manoeuvre on two‐lane highway operational performance is considered through adjustment factors to average travel speeds and percent time spent following. The procedure is largely based on simulations in TWOPAS and passing behaviours observed during US calibrations in the 1970s. It is not clear whether US driving behaviour and vehicles' performance are comparable with Spanish conditions. The objective of this research is to adapt the HCM 2010 methodology to Spanish driver behaviour, for base conditions (i.e. no passing restrictions). To do so, TWOPAS was calibrated and validated based on current Spanish passing field data. The calibration used a genetic algorithm. The case study included an ideal two‐lane highway with varying directional traffic flow rate, directional split and percentage of trucks. The updated methodology for base conditions is simpler than the current HCM 2010 and does not rely on interpolation from tables. Copyright © 2016 John Wiley & Sons, Ltd. |
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| Keywords: | traffic operation two‐lane highway percent time spent following average speed percent followers genetic algorithm |
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