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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

vertical clearance

  • Language : PIARC Road Dictionary / English
  • Theme : Structures Tunnels
  • Definition : Vertical distance between the maintained headroom and the minimum headroom, needed to allow for height uncertainties during construction, possible future strengthening of the pavement, protection of equipment, etc.

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