1. Home
  2. TRID
  3. View Record
https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

Optimization of pavement maintenance funding

Paallysteiden yllapidon rahoitustarpeen optimointi. PYRO-malli

PYRO-model is a forecasting and optimization model for long term network level pavement maintenance analysis. The most typical analyses consider funding needs to maintain the current condition distribution or condition forecasting with current limited funding. Key computed results are annual funding needs per subnetwork, maintenance lengths by different types of measures and expected development of poor conditioned road length. Data processing, optimization and presentation of the results are all run by stand alone software, thus replacing the need to develop an extensive integrated data system. Result are presented in standard MS Excel files and summary reports. Having come through multiple development steps, PYRO-model is quite established and operable for various analyses. Functioning of the model is quite similar to the closed down HIPS-system, although the PYRO-model does not employ user costs. Modified model structure has enabled several new features that improve correspondence between practical maintenance programming and network level analyses, and thus provide more realistic results. Key new features are the modelling of feasible maintenance chains and unhomogeneity of maintenance sites as well as an intuitive method for determining the deterioration parameters based on average replacement cycles. The PYRO-model won an R&D award in a Nordic pavement conference in 2009. We have also developed a regional funding allocation tool which utilizes the long term national results computed by the PYRO-model. The user allocates the available overall funding to different road classes according to the general maintenance strategy and the tool allocates it further to the regional districts based on facts of road lengths and traffic in the different classes. Results of the PYRO-model support communication and justification of overall funding requests for long term planning, whereas the allocation tool supports critical decision making in annual budgeting. This report focuses on the models themselves and the R&D work in their development. Thus, the few numerical results serve only as illustrations from computations with 2010 data. The lighter R&D approach with stand alone software and outsourced operation, instead of a full in-house data system, has proven to be a rapid and flexible way of developing and running these types of complex analyses. We recommend continuing use and R&D of the PYRO-model, and the allocation tool is available for utilization at the Transport Agency. Potential developments include a network level analysis of intersection ramps, modelling of maintenance strategies that would adjust themselves automatically based on network condition and pre-studying if the model could be applied to the maintenance of other structures as well. In addition, separate models could be developed to analyze the use of patching measures to extend pavement lifecycle and thus maintenance site length as well as the use of driving cost to determine techno-economically optimal replacement cycles of various structures. This report may be found at http://alk.tiehallinto.fi/julkaisut/pdf3/lts_2011-07_paallysteiden_yllapidon_web.pdf

Language

  • Finnish

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01360556
  • Record Type: Publication
  • Source Agency: Finnish Transport Agency
  • ISBN: 978-952-255-620-2
  • Files: ITRD
  • Created Date: Jan 11 2012 9:22AM