Open invitation to tender, deadline 01.04.2013, for assistance during safety improvement in Boezberg (3,705 m, 3,705 m), Schinznacherfeld (450 m, 450 m) and Habsburg (1,530 m, 1,550 m) tunnels on N03 motorway and for refurbishment of outside tunnel sections. Contract duration 01.07.2013 to 30.06.2018. For further http://www.simap.ch/shabforms/servlet/Search?NOTICE_NR=764337. Tenders must be sent to Astra, Zofingue, att.n N03, 080342, TUBO TUSI / BHU BSA, tel +41 62 745 75 11, fax +41 62 745 75 90, e-mail beschaffung.zofingen@astra.admin.ch. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=062981-2013. 09/13.