SCRCA Note: Structures associated with Bridge 223 (Helm Tunnel)

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General Note
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For the purposes of the SCRCA Project, the 'tunnel' (structure type BT) is the underground structure between, but not including, the two tunnel-mouths / portals (which are structure type TM). The approximate mid-point of the tunnel is used to determine its geographic location. The following structures are directly associated with this tunnel:
      273150: Helm Tunnel South Portal (Bridge No 223)
      273480: Helm Tunnel North Portal (Bridge No 223)

Last updated by Mark Harvey on 21/04/2014
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