Call for Papers for the 6th International Symposium on Tunnel Safety and Security (ISTSS 2014), to be held at World Trade Centre (WTC) in Marseille, France, 12-14^th  March, 2014. Manuscripts and posters submitted for presentation will be reviewed on the basis of an extended abstract of not more than two pages. Manuscript abstracts should be submitted to the Secretariat by email istss@sp.se by 31^st May, 2013. For more information visit http://www.istss.se/EN/Sidor/default.aspx. 12/13.