An outline for a validation database for SAMGODS

Magnus Johansson

A new Swedish national goods transportation model, SAMGODS, has been developed through collaboration among Swedish transport authorities. As the model recently has begun to be applied to real world problems, the need for a validation database has increased. The purpose of such a database is to facilitate validations of the model. The current paper presents a pilot study to create a validation database for SAMGODS. The study focuses on two areas: available data sources that may provide validation data, and how to carry out the validation in practice. The latter is of particular importance since a large number of practical problems arise when matching SAMGODS output data with the validation data. Worth mentioning among the problems that arise are: the inhomogeneous structure of the data tables, the often differing aggregation levels between model output data and validation data, differing time periods, differing systems for commodity groups and elasticities not being immediately available from the SAMGODS data. Other complicating issues are handling of confidential data and the large quantities of data. In this report, a relatively detailed proposal for the design of a validation database is put forward. However, the proposed design is not limited to SAMGODS output data, but it is hoped to be sufficiently flexible to comprise also other goods transportation data from future regional or local models. One of the main ideas in designing the database has been to develop a uniform and flexible data table format in which all relevant data can be stored. This format greatly facilitates the matching between SAMGODS output data and the validation data. Other problems and associated possible solutions are thoroughly discussed.



Millions for research into maritime transport and the environment

Maritime transport is a major source of emissions of harmful air pollutants and carbon dioxide. In a new project, a research team from the Swedish National Road and Transport Research Institute (VTI) and the University of Gothenburg has received SEK 6.4...


New research programme for more efficient travel

The Swedish National Road and Transport Research Institute (VTI) is playing an important role in a major new research programme to find radical solutions leading to fewer trips and more efficient travel, along with tools to enable better use of roads and...


Simulator used to practice emergency responses safely

Emergency responses of the police, ambulance, and rescue services are associated with a high risk of accidents, but practicing them in real traffic is neither safe nor permissible. A simulator-based method developed by the Swedish National Road and Transport...


Simulation of cut-in by manually driven vehicles in platooning scenarios

A study in a VTI-driving simulator has showed that a platoon will be able to handle a cut in from a manually driven car. The results of this study have recently been presented at two conferences in Japan.



The five-year anniversary of European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017.


Self-driving buses in Sweden next year?

A self-driving, fossil-free bus. This idea might become reality through a forthcoming collaborative project involving the Swedish National Road and Transport Research Institute (VTI), Linköping University and several other participants. The project group aim...