Tunnel Project Extractor
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AS1158.5 Figure 2.2 — Basic Decision Flow
1) Is there see‑through?
2) Is road element > 125 m long?
3) Is road element > 75 m long?
4) Does the tunnel length require an interior zone?
5) What is the see‑through percentage (STP)?
STP < 20% → TU3; STP 20–80% → TU4 (SSA required); STP > 80% → TU5.