# 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 1.1: Road signs shall be used to designate the following safety facilities in tunnels:

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

lay-bys,
emergency exits: the same sign shall be used for all kinds of emergency exits,
escape routes: the two nearest emergency exits shall be signed on the sidewalls at distances of no more than 25 metres, at a height of 1,0 to 1,5 metres above escape route level, with an indication of the distances to the exits,
emergency stations: signs to indicate the presence of emergency phones and fire extinguishers.

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Source: https://www.legislation.gov.uk/eudr/2004/54/annex/III/division/1.1 (the official version)
Page: https://openlegislation.uk/eu-directive-2004-54/annex-III/division-1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.