QRA model -based risk impact analysis of traffic flow in urban road tunnels

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      <subfield code="a">QRA model -based risk impact analysis of traffic flow in urban road tunnels</subfield>
      <subfield code="c">Qiang Meng... [et al.]</subfield>
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      <subfield code="a">Road tunnels are vital infrastructures providing underground vehicular passageways for commuters and motorists. Various quantitative risk assessment (QRA) models have recently been developed and employed  to evaluate the safety levels of road tunnels in terms of societal risk (as measured by the F/N curve). For a particular road tunnel, traffic volume and proportion of heavy goods vehicles (HGVs) are two adjustable parameters that may significantly affect the societal risk, and are thus very useful in implementing risk reduction solutions.
To evaluate the impact the two contributing factors have on the risk, this article first presents an approach that employs a QRA model to generate societal risk for a series of possible combinations of the two factors. Some combinations may result in F/N curves that do not fulfill a predetermined safety target. This article thus proposes an excess risk index in order to quantify the road tunnel risk magnitudes that do not pass the safety target. The twofactor impact analysis can be illustrated by a contour chart based on the excess risk. Finally, the methodology has been applied to Singapores KPE road tunnel and the results show  that in terms of meeting the test safety target for societal risk, the traffic capacity of the tunnel should be no more than 1,200 vehs/h/lane, with a maximum proportion of 18% HGVs </subfield>
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      <subfield code="a">Evaluación de riesgos</subfield>
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      <subfield code="a">Meng, Qiang</subfield>
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      <subfield code="t">Risk analysis : an international journal</subfield>
      <subfield code="d">McLean, Virginia : Society for Risk Analysis, 1987-2015</subfield>
      <subfield code="x">0272-4332</subfield>
      <subfield code="g">01/12/2011 Tomo 31 Número 12  - 2011 , p. 1872-1882</subfield>
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