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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

Impact of road condition on driving costs for paved and gravel roads

Ajokustannusten kuntoriippuvuus paallystetyilla teilla ja sorateilla

The purpose of this work was to develop driving cost models that are dependent on the condition of the road, particularly for programming-level examinations. Behind this was the fact that the models currently used by Finnra needed updating and supplementation, and after they were taken into use new information has been obtained about connections between driving costs, road circumstances and especially road conditions. The goal was to produce a clear-cut range of models that covers both paved roads and gravel roads and also takes into consideration bridges and their condition. The work was begun by analyzing the driving cost models currently used in the HIPS system. The most important models used abroad (the World Bank's HDM and Scandinavian systems) were also studied. At the same time the latest knowledge was gathered from the various partial areas related to the work (vehicle, time, accident and environment-related costs). The possibility of including new important factors, which were previously neglected or only used in project examinations, in network-level examinations was also investigated. These factors include noise, contamination and driving comfort, in particular. The result is a model system that takes into consideration the condition of the road in addition to conventional transport-related factors (type of road, traffic, etc.). To describe condition, a combined condition variable was developed which includes components that describe road smoothness, road damage and rut formation. Average speed and speed deviation models that are capable of taking the condition variable into consideration were developed for light, heavy and articulated vehicles. Models for time-related costs, fuel costs, vehicle costs, accident seriousness and costs, exhaust emissions, emission costs, traffic noise, dust formation, and noise and dust impact costs were constructed with the help of the speed models and variables that depict the road network. It was not possible to assign values to driving comfort for inclusion in the cost models. The new models were tested by using them to calculate driving costs for different types of roads in different condition situations. The models functioned logically in the tests, and their structure permits them to be linked to currently used systems in pieces, if necessary. This structure also makes them easy to update. It was decided to propose that Finnra should implement the new models in its network-level programming systems. Deficiencies in knowledge noticed during this work were recorded so they can be taken into consideration when planning Finnra's research activity. This report may be found at http://alk.tiehallinto.fi/julkaisut/pdf/3200965-vajokustannusten_kuntoriippuvuus.pdf

Language

  • Finnish

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Filing Info

  • Accession Number: 01024084
  • Record Type: Publication
  • Source Agency: TRL
  • ISBN: 3200965
  • Files: ITRD
  • Created Date: May 18 2006 8:29AM