Open invitation to tender, deadline 26.06.2013, for refurbishment of Grenzstrasse tunnel in Cologne, which is a stacked tunnel with three lanes in each direction, the upper tube 320 m-long and lower tube 540 m-long. Duration of contract 590 days after award. More from Stadt Koeln, e-mail dorothea.kreutz@stadt-koeln.de. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=154583-2013. 20/13.
