|
TUNNEL |
|
| SN | An underground channel with a vaulted roof. Use specific type where known. |
| CL |
UNASSIGNED |
| NT |
EMERGENCY EXIT TUNNEL
ESCAPE TUNNEL |
| RT |
ADIT
CANAL TUNNEL HORSE TUNNEL PEDESTRIAN TUNNEL RAILWAY TUNNEL ROAD TUNNEL SERVICE SHAFT SHAFT TRAMWAY TUNNEL TRANSPORT TUNNEL TUNNEL PORTAL UNDERGROUND RAILWAY TUNNEL UNDERGROUND STRUCTURE WATER TUNNEL
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