Artikel 13

1. Prohibitory, restrictive and mandatory signs shall be placed in the immediate vicinity of the point where the obligation, restriction or prohibition begins and may be repeated if the competent authorities consider it necessary. Nevertheless, if the competent authorities consider it advisable for reasons of visibility or in order to give users advance warning, these signs may be placed at a suitable distance in advance of the point where the obligation, restriction or prohibition applies. An additional pannel H, 1 of Annex 1, section H shall be placed under signs set up in advance of the point where the obligation, restriction or prohibition applies.
2. Regulatory signs placed level with or shortly after a sign indicating the beginning of a built-up area shall mean that the rule applies throughout the built-up area, unless a different rule is notified by other signs on certain sections of the road in the built-up area.
3. Prohibitory and restrictive signs shall apply as from the place they are displayed until the point where a contrary sign is displayed, otherwise until the next intersection. If the prohibition or restriction should continue to be applied after the intersection the sign shall be repeated in accordance with provisions in domestic legislation.
4. Where a regulatory sign applies to all roads in a zone (zonal validity), it shall be displayed in the way described in Annex 1, section E, subsection II, paragraph 8 a) to this Convention.
5. The exit from the zones referred to in paragraph 4 above shall be indicated in the way described in Annex 1, section E, subsection II, paragraph 8 b) to this Convention.