Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Milepost | Name of the tunnel | Length | Maximum Height | Minimum Height |
| --- | --- | --- | --- | --- |
| 53.1 | Bluff Mountain Tunnel | feet (m) | feet 1inch (m) | feet 7inches (m) |
| 333.4 | Little Switzerland Tunnel | feet (m) | feet 8inches (m) | feet 4inches (m) |
| 336.4 | Wild Acres Tunnel | feet (m) | feet 10inches (m) | feet 1inch (m) |
| 344.6 | Twin Tunnel #1 North | feet (m) | feet (m) | feet (m) |
| 344.7 | Twin Tunnel #2 South | feet (m) | feet 7inches (m) | feet 7inches (m) |
| 349.0 | Rough Ridge Tunnel | feet (m) | feet 6inches (m) | feet 9inches (m) |
| 364.4 | Craggy Pinnacle Tunnel | feet (m) | feet 9inches (m) | feet 1inch (m) |
| 365.6 | Craggy Flats Tunnel | feet (m) | feet 5inches (m) | feet 1inch (m) |
| 374.4 | Tanbark Ridge Tunnel | feet (m) | feet 5inches (m) | feet 1inch (m) |
| 397.1 | Grassy Knob Tunnel | feet (m) | feet 2inches (m) | feet 7inches (m) |
| 399.3 | Pine Mountain Tunnel | feet (m) | feet 3inches (m) | feet 2inches (m) |
| 400.9 | Ferrin Knob Tunnel #1 | feet (m) | feet 6inches (m) | feet 2inches (m) |
| 401.3 | Ferrin Knob Tunnel #2 | feet (m) | feet 2inches (m) | feet (m) |
| 401.5 | Ferrin Knob Tunnel #3 | feet (m) | feet 5inches (m) | feet 9inches (m) |
| 403.0 | Young Pisgah Ridge Tunnel | feet (m) | feet 8inches (m) | feet 6inches (m) |
| 403.9 | Fort Mountain Tunnel | feet (m) | feet 2inches (m) | feet 6inches (m) |
| 406.9 | Little Pisgah Tunnel | feet (m) | feet 5inches (m) | feet 10inches (m) |
| 407.4 | Buck Springs Tunnel | feet (m) | feet 2inches (m) | feet 8inches (m) |
| 410.1 | Frying Pan Tunnel | feet (m) | feet 9inches (m) | feet 8inches (m) |
| 422.1 | Devil's Courthouse Tunnel | feet (m) | feet (m) | feet 2inches (m) |
| 439.7 | Pinnacle Ridge | feet (m) | feet 1inch (m) | feet 10inches (m) |
| 458.8 | Lickstone Ridge Tunnel | feet (m) | feet 1inch (m) | feet 1inch (m) |
| 459.3 | Bunches Bald Tunnel | feet (m) | feet 4inches (m) | feet 6inches (m) |
| 461.2 | Big Witch Tunnel | feet (m) | feet 1inch (m) | feet 3inches (m) |
| 465.6 | Rattlesnake Mountain Tunnel | feet (m) | feet 6inches (m) | feet 5inches (m) |
| 466.3 | Sherril Cove No. 6 Tunnel | feet (m) | feet 7inches (m) | feet 4inches (m) |
Question:
What is the Milepost of the Twin Tunnel #1 North?
Answer:
1.0