Developing standards for weight limitation policies. Road Asset Management Research Program (VOH)

Painorajoitussuunnittelun kriteerien kehittaminen. Vaylaomaisuuden hallinnan tutkimusohjelma (VOH)

The nature of structural thaw weakening on gravel roads has changed during the inventory period 1996-2006. Currently, structural thaw weakening is characterized by damaged areas 20.30m in length instead of longer thaw-weakened sections. Besides the influence of a renewed road damage inventory system, the change has been affected by an increased investment in the repair of thaw-weakened sections of road. As a result, the overall length of weight restricted roads has decreased. On the basis of the received feedback, predicting weight limitations has been proved to be useful especially in the form of notifying the various interest groups of the roads with a potential of becoming weight restricted. Notification has decreased the amount of traffic during periods of structural thaw-weakening. This has, for its part, levelled off the overall number of actual thaw-weakening problems. The above phenomenon will gain in significance in springs with forecasts of rough weather conditions. The fundamental goal of this project has been to review the action model for the identification of weight limitation targets on both paved and gravel roads. On the basis of this project work, measures for the development of weight limitation policies are proposed with respect to the following issues: (1) the follow-up of the melting of road structure and the observation of the prevailing weather conditions in springtime (2) the time of imposing and releasing weight limitations (3) the procedure of thaw weakening inventories (4) guidelining the classification of structural thaw weakening (thaw-weakening lists (5) the reviewing of structural thaw weakening criteria. In addition, the project work suggests that more accurate recording of implemented and planned measures is needed. Regular notification (the so called repair lists)concerning structural thaw weakening, paving / improvements and the measure plan of the coming summer is of great importance in weight limitations planning. The changes recommended in the project report will decrease the number of roads with a potential for becoming weight limited. In addition, a review of the criteria for paved roads will shift the focus from soft asphalt roads towards the protection of surface treated gravel roads. This report may be found at


  • Finnish

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  • Accession Number: 01043675
  • Record Type: Publication
  • Source Agency: TRL
  • ISBN: 978-951-803-827-9
  • Files: ITRD
  • Created Date: Mar 9 2007 8:07AM