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21
2025
-
04
Standard for classifying the length of highway tunnels
Author:
1. Short Tunnels: Railway tunnels with a length less than or equal to 500 meters; Road tunnels with a length less than or equal to 500 meters.
2. Medium-length Tunnels: Railway tunnels with a length greater than 500 meters and less than 3000 meters; Road tunnels with a length greater than 500 meters and less than 1000 meters.
3. Long Tunnels: Railway tunnels with a length less than 3000 meters and greater than 10000 meters; Road tunnels with a length less than 1000 meters and greater than 3000 meters.
4. Extra-long Tunnels: Railway tunnels with a length greater than 10000 meters; Road tunnels with a length greater than 3000 meters.
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