Open invitation to tender, deadline 31/03/2023, for support to the client both for the civil engineering works and for the safety equipment in the group of Brusei tunnels on the N13. A new safety tunnel will be built and the ventilation system needs to be renewed. These measures will increase the safety of the tunnel. The duration of the contract is from 03/07/2023 to 31/12/2031. For further information on the tender please click here (Italian), here (French).  Contact Ofrou, Bellizona, tel +41 58 469 68 11, fax  +41 58 469 68 90, email acquistipubblici@astra.admin.ch. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=050056-2023.  Ref.n. MP-110052. 05/23.    http://www.simap.ch/shabforms/servlet/Search?NOTICE_NR=1311091  http://www.simap.ch/shabforms/servlet/Search?NOTICE_NR=1311109