Selected issues in traffic model construction

Abstract: The issues concern the construction of a 4-stage traffic model in accordance with the methodology recommended by the Blue Book. Key issues related to the data necessary for the execution of partial models are presented, which consist of: a traffic generation model, a spatial distribution model, a modal split model, and a traffic assignment model to the transport network.1. INTRODUCTION
The article presents selected issues of traffic model construction that may occur in practice during the collection and processing of source data – both during the description of mobility and travel preferences of residents, as well as during the description of the transport network. It is based on examples from the literature on the subject as well as on own experience gained during work on a traffic model as part of a study for 13 cities of the Upper Silesian agglomeration [6].
The necessity of building a 4-stage model from scratch, for the needs of the aforementioned study, was dictated by the lack of any traffic model for the Upper Silesian agglomeration and the adoption of the work methodology provided in the Blue Book [5]. The model used existing current traffic studies and measurements and performed
The principles provided in the manual are recommended for all projects that will be financed from public funds.
The proposed methodology is intended to be adapted to the requirements of applications for financing large projects submitted to the European Commission, that is, in the case of public transport projects financed from the cohesion fund, those projects whose total cost exceeds 25 million EUR.
additionally supplementary studies in order to increase the accuracy of data and the reliability of the model. In the study [6], all three stages of traffic analysis and forecasting were carried out in full, the scheme of which is shown in Figure 1. The forecast results for
7 time horizons: 2013, 2018, 2023, 2028, 2033, 2038, 2043 were used to conduct a cost-benefit analysis (CBA) for 4 investment variants compared with the base variant (reference variant). (…)

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