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7. Urban tunnels with authorized clearance less than (or equal to) 3.50 m
These tunnels are normally closed to TDG.
Three gauges are used: 2 m, 2.70 m and 3.50 m. Smoke extraction systems are required for tunnels longer than 300 m, and safety provisions are governed by the same rules as for other tunnels.
7.1 Differences requiring special provisions
Here are 3 points to consider:
emergency vehicle access for tunnels with a gauge of 2 to 2.7 m, which do not allow the use of standard fire-fighting vehicles: only asphyxiated and injured rescue vehicles (VSAB) can enter tunnels with a gauge of 2.70 m. In all other cases, specific provisions concerning rescue operations and the size of their vehicles will have to be studied;
underground...
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Urban tunnels with authorized clearance less than (or equal to) 3.50 m
Signage
Bibliography
Websites
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French Tunnel and Underground Space Association – AFTES
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Center d'études des tunnels – CETU
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Regulations
Law no. 2002-3 of January 3, 2002 on the safety of transport infrastructures and systems, technical investigations following sea, land or air transport accidents or incidents, and underground storage of natural gas, hydrocarbons and chemicals.
Decree no. 2005-701 of June 24, 2005 for the application of law no. 2002-3.
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