The National Transport Model for the Republic of Croatia – Development of the Freight Demand Model

4th International Conference on Road and Rail Infrastructure (CETRA 2016)

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Title The National Transport Model for the Republic of Croatia – Development of the Freight Demand Model
Creator Jens Landmann
Andree Thomas
Igor Majstorovic
Gregor Pretnar
Subject transport model; freight demand model; calibration; validation
Description National transport model of Croatia (NTMC) consists of network, demand and assignment submodels. Whilst network model (nodes, links, zones) is common, approaches for demand and assignment differ between passenger and freight transport. Each type of transport requires specific methods. This paper describes development of the freight demand model, namely its input data, modelling methods, calibration and validation. The main inputs for modelling of freight transport are socioeconomic data and national statistics on production and trade flows (import / export). Socioeconomic data was collected on the zoning level. For production and import / export, the statistical data was available at national level and was broken down to zoning level according to the socioeconomic data of each zone. Main source for socioeconomic data (population, employment, working places by economic sector) were national statistics (Croatian Bureau of Statistics). Sources for production data depend of the type of commodity, while import / export data was derived from the national trade statistics. The freight demand model considers all transport modes relevant from a national perspective, i.e. road (HGV and LGV), rail and vessel. The modal freight trip matrices are calculated with a commodity based multi-modal model using an enhanced 4-step approach. For the adequate consideration of commodity-specific affinities, the freight traffic is segmented into 50 different commodities; each of them having specific generation and attraction rates as well as specific modal transport cost rates. The calculation steps of the enhanced 4-step approach are conducted separately for each commodity. The multi-modal freight model, which mainly generates the long-distance trips, is supplemented by a submodel for generating the freight trips from / to the airports and by a sub-model for the local (short-distance) distribution trips by HGV and LGV.
Publisher CETRA 2016
Contributor SAFU; Ministry of Maritime Affairs, Transport and Infrastructure
Date 2017-02-28 15:21:17
Type Peer-reviewed Paper
Format application/pdf
Source CETRA 2016; 4th International Conference on Road and Rail Infrastructure
Language en
Rights Authors who submit to this conference agree to the following terms:<br /> <strong>a)</strong> Authors retain copyright over their work, while allowing the conference to place this unpublished work under a <a href="">Creative Commons Attribution License</a>, which allows others to freely access, use, and share the work, with an acknowledgement of the work's authorship and its initial presentation at this conference. <br /> <strong>b)</strong> Submitted full papers will be published in the book of proceedings "Road and Rail Infrastructure IV" as well as in digital form (on a CD). Conference organiser is allowed to publish author's names, institution and country as well as the paper abstract on the conference web site.

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