Description of the sign has come out oddly and makes no sense.
French often use flashing signs for emphasis particualry with prohibition. May be tunnel speed/spacing restricrion Other likely restrictions in tunnels include conveyance of flammable or hazardous material. LPG powered vehicles as well in some places (IIRC).
Some more examples of French usage here tinyurl.com/25sg6z
Edited by Bromptonaut on 02/02/2008 at 09:50
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