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Author Kalahasthi, L.K.; Sutar, P.; Yushimito, W.F.; Holguin-Veras, J. doi  openurl
  Title Optimal Sampling Plan for Freight Demand Synthesis with Mode Choice: A Case study of Bangladesh Type
  Year 2023 Publication Transportation Research Record Abbreviated Journal Transp. Res. Record  
  Volume Early Access Issue Pages  
  Keywords freight systems; general; freight model; modeling  
  Abstract This paper uses a comprehensive experimental design to investigate the influence of various traffic count sampling plans for Bangladesh on the performance of the Freight Origin-Destination Synthesis model with Mode Choice (FODS-MC) developed by Kalahasthi et al. FODS-MC estimates a national-level freight demand model including trip distribution, mode choice, empty truck trips, and empty rail trips, where one of the key inputs is the freight truck and rail, traffic counts. The traffic count sample comprises three types of road links (national, regional, and zilla) and one category for the rail link across the country. A Box-Behnken Design (BBD) with a response surface for each of four FODS-MC parameters (distribution, mode choice, truck empty trips, and rail empty trips) is constructed. The results showed that the response surfaces are nonlinear planes for all parameters. There is no single optimal sampling plan for FODS-MC as each model parameter demands different distribution across the truck and rail links. The random and stratified samples perform almost similarly if less than 20% of the sample is collected. Minimizing the loss functions between the estimated and true parameters shows that a random sample between 20% and 25% of the truck and rail links estimates the best freight demand model. Overall, this research develops a framework to assist public practitioners in the optimum usage of the limited time and resources in collecting the traffic count data that could estimate the freight demand and mode choice models effectively.  
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  Series Volume Series Issue Edition  
  ISSN 0361-1981 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001007363400001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1818  
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Author Kalahasthi, L.; Holguin-Veras, J.; Yushimito, W.F. doi  openurl
  Title A freight origin-destination synthesis model with mode choice Type
  Year 2022 Publication Transportation Research Part E-Logistics and Transportation Review Abbreviated Journal Transp. Res. E-Logist. Transp. Rev.  
  Volume 157 Issue Pages 102595  
  Keywords Freight origin-destination synthesis; Freight mode choice; Nonconvex optimization  
  Abstract This paper develops a novel procedure to conduct a Freight Origin-Destination Synthesis (FODS) that jointly estimates the trip distribution, mode choice, and the empty trips by truck and rail that provide the best match to the observed freight traffic counts. Four models are integrated: (1) a gravity model for trip distribution, (2) a binary logit model for mode choice, (3) a Noortman and Van Es' model for truck, and (4) a Noortman and Van Es' model for rail empty trips. The estimation process entails an iterative minimization of a nonconvex objective function, the summation of squared errors of the estimated truck and rail traffic counts with respect to the five model parameters. Of the two methods tested to address the nonconvexity, an interior point method with a set of random starting points (Multi-Start algorithm) outperformed the Ordinary Least Squared (OLS) inference technique. The potential of this methodology is examined using a hypothetical example of developing a nationwide freight demand model for Bangladesh. This research improves the existing FODS techniques that use readily available secondary data such as traffic counts and link costs, allowing transportation planners to evaluate policy outcomes without needing expensive freight data collection. This paper presents the results, model validation, limitations, and future scope for improvements.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1366-5545 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000793142700006 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1584  
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