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Status: STD 2005/06/07
Code: 1486

Concept definition: The characteristic cross-sectional shape of a <TUNNEL> when viewed from the ends.
Attribute value type: ENUMERATION
Reference type: IR
Reference: [FACC, Annex B: TCS]
Supplemental references:  

Enumerants (presented in a natural order)
Status Attribute label Enumerant label Concept definition ▾ Code Ref type Reference Supplemental references
TUNNEL_CROSS_SECTION CIRCULAR Consists of a curved top extending smoothly to the floor, circular. 3 PR [FACC, Annex B, TCS:3]  
TUNNEL_CROSS_SECTION ARCH Consists of a curved top on two vertical sidewalls; arch. 1 PR [FACC, Annex B, TCS:1]  
TUNNEL_CROSS_SECTION BOX Consists of a flat top on two vertical sidewalls; box. 2 PR [FACC, Annex B, TCS:2]  

Group membership:

In addition to the status and date information for each entry, a colour coding scheme highlights the database holding to which an entry belongs. The following highlight colours are used:

  • white - the entry is in the standard
  • yellow - the entry has been added to the register
  • pink - the entry has been submitted for inclusion in the register, but it is not approved
  • cyan - a deprecated entry that was originally either in the standard or was added to the register, but has since been deprecated

The following icons are used to identify items that have figures, modifications and/or clarification notes:

  • F n - has Figures and, if more than one figure, n figures
  • M - has Modifications
  • C - has Clarifications

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