A multiple criteria approach for evaluation of tunnel safety in Iran: a case study of Ardabil province

Nima Dadashzadeh*, Vahid Mirmohammadi, Jafar Azimi

*Corresponding author for this work

Research output: Contribution to conferenceAbstractpeer-review


Various factors have the effect on the safety of road tunnels and some of them including tunnel lighting, the existence of curve, pavement condition, drainage and insulating, traffic horizontal and verticals signs inside tunnel are selected, in this study, as most important parameters in developing tunnel safety. These factors are evaluated using the Analytic Hierarchy Process (AHP), as a multiple criteria decision support system. The AHP is a powerful and flexible decision-making process to help administrators set priorities and make the best decision. In the AHP, a problem is structured as a hierarchy. Having constructed the hierarchy, the prioritization procedure begins to determine the relative importance of the elements in each level. Based on this analysis, the decision makers developed a new approach as a combination of the most closely competing of several factors which affected on the tunnel safety for accidents prevention and casualties in tunnels. Assessment of tunnels safety status associated with effective and major criteria in safety of tunnels, in terms of inspecting, are the other objectives of this research. Ardabil province road tunnels, as one of the most transportable roads of the country, are evaluated regarding safety status and safety index which have been assigned for all tunnels in the road. According to information collected related to accidents happened in tunnels, there were meaningful relations between tunnels safety index and the number of accidents in the tunnels of the given road. There were more accidents in the tunnels bearing least safety index which show requesting more attention for necessary methods and ways of tunnel safety for decreasing accidents. In this study, it is shown that tunnel lighting (%32), traffic horizontal and verticals signs totally (%29), existences of curve inside a tunnel (%23), drainage and insulation (%9) and pavement condition inside of tunnel (%7) are effective on safety of road tunnels respectively.
Original languageEnglish
Number of pages1
Publication statusPublished - 15 Jul 2015
Event18th Meeting of the EURO Working Group on Transportation - Delft, Netherlands
Duration: 14 Jul 201516 Jul 2015


Conference18th Meeting of the EURO Working Group on Transportation
Abbreviated titleEWGT 2015


  • safety assessment
  • tunnel safety
  • multiple-criteria analysis
  • analytic hierarchy process (AHP)


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