Search results for "AIMSUN"

showing 3 items of 13 documents

Capacity-based calculation of passenger car equivalents using traffic simulation at double-lane roundabouts

2018

Abstract Calculation of passenger car equivalents for heavy vehicles represents the starting point for the operational analysis of road facilities and other traffic management applications. This paper introduces a criterion to find the passenger car equivalents that reflect traffic conditions at double-lane roundabouts, where the capacity is typically estimated for each entry lane. Based on the equivalence defined by the proportion of capacity used by vehicles of different classes, the criterion implies a comparison between the capacity that would occur with a traffic demand of passenger cars only and the capacity reached beginning from a demand with a certain percentage of heavy vehicles. …

Traffic microsimulationGenetic algorithmAIMSUNPassenger car equivalentDouble-lane roundabout050210 logistics & transportationComputer scienceSubroutine05 social sciencesTraffic simulation02 engineering and technologyAutomotive engineeringSettore ING-INF/04 - AutomaticaHardware and ArchitectureModeling and Simulation0502 economics and businessTraffic conditionsRoundabout0202 electrical engineering electronic engineering information engineeringSettore ICAR/04 - Strade Ferrovie Ed Aeroporti020201 artificial intelligence & image processingSoftwareSimulation Modelling Practice and Theory
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Application of a genetic algorithm in calibration of traffic microsimulation models

2017

This chapter describes the genetic algorithm-based calibration procedure for a microscopic traffic simulation model focusing on freeways and modern roundabouts. For both case studies, the genetic algorithm tool in MATLAB® was applied in order to reach the convergence between the outputs from Aimsun microscopic simulator and the observed data. The automatic interaction with Aimsun software was implemented through an original external Python script. Results showed that the genetic algorithm-based calibration procedure gave a better match to the observed data than simple manual calibration and the efficiency of the calibration efforts resulted significantly improved. At last, the calbrated mod…

calibration Aimsun genetic algorithm freeways single-lane roundabouts passenger car equivalentSettore ING-INF/04 - AutomaticaSettore ICAR/04 - Strade Ferrovie Ed Aeroporti
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A statistical approach for calibrating a microsimulation model for freeways

2014

In this paper the calibration of a traffic microsimulation model based on speed-density relationships is presented. Hypothesis test was applied in the calibration process to measure the closeness between empirical data and simulation outputs and determine whether the difference between (observed and simulated) speed-density relationships was statistically significant. Statistical regressions between the variables of traffic flow were developed by using traffic data observed at the A22 Brenner Freeway, Italy. Similar relationships were obtained for a test freeway segment in uncongested conditions of traffic flow by using the Aimsun microscopic simulator; thus on field conditions were reprodu…

freeway traffic microsimulation speed-density relationship calibration AimsunSettore ICAR/04 - Strade Ferrovie Ed Aeroporti
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