# Directive 2004/54/EC of the European Parliament and of the Council of 29 April 2004 on minimum safety requirements for tunnels in the trans-European road network, Division 2.1.1

Extent: E+W+S+N.I.

The main criteria for deciding whether to build a single or a twin-tube tunnel shall be projected traffic volume and safety, taking into account aspects such as the percentage of heavy goods vehicles, gradient and length.

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Source: https://www.legislation.gov.uk/eudr/2004/54/annex/I/division/2.1.1 (the official version)
Page: https://openlegislation.uk/eu-directive-2004-54/annex-I/division-2.1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.