Division 1 General requirementsX1

The following are road signs and symbols to be used for tunnels. Road signs mentioned in this section are described in the Vienna Convention on Road Signs and Signals of 1968, unless otherwise specified.

In order to facilitate international understanding of signs, the system of signs and signals prescribed in this Annex is based on the use of shapes and colours characteristic of each class of sign and, wherever possible, on the use of graphic symbols rather than words. Where Member States consider it necessary to modify the signs and symbols prescribed, the modifications made shall not alter their essential characteristics. Where Member States do not apply the Vienna Convention, the prescribed signs and symbols may be modified, provided that the modifications made shall not alter their essential intent.