1. 3) Directive 2004/54/EC of European Parliament and of the Council of 29 April 2004 on minimum safety requirements for tunnels in the trans-European road network, Official Journal of the European Union, L167 of 30 April 2004.
2. 4) Fire and Smoke Control in Road Tunnels, 05.05.B, PIARC Committee on Road Tunnels (C5), 1999.
3. 5) Current Practice for Risk Evaluation for Road Tunnels 2012 PIARC Technical Committee C. 4 Road Tunnel Operation.
4. 13) Linee Guida per la progettazione della sicurezza nelle Gallerie Stradali, ANAS S.p.A. Direzione Centrale Progettazione, pp. 53, Novembre 2006.