Convention on Road Traffic
ANNEXES
Annex 3
DISTINGUISHING SIGN OF MOTOR VEHICLES AND TRAILERS IN INTERNATIONAL TRAFFIC
1. The distinguishing sign referred to in Article 37 of this Convention shall consist of one to three letters in capital Latin characters. The letters shall have a height of at least 0.08 m and their strokes a width of at least 0.01 m. The letters shall be painted in black on a white ground having the shape of an ellipse with the major axis horizontal.
2. When the distinguishing sign consists of only one letter, the major axis of the ellipse may be vertical.
3. The distinguishing sign shall not be incorporated in the registration number, or be affixed in such a way that it could be confused with that number or impair its legibility.
4. On motor cycles and their trailers, the dimensions of the axes of the ellipse shall be at least 0.175 m and 0.115 m. On other motor vehicles and their trailers, the dimensions of the axes of the ellipse shall be at least:
(a) 0.24 m and 0.145 m if the distinguishing sign comprises three letters;
(b) 0.175 m and 0.115m if the distinguishing sign comprises less than three letters.
5. The provisions of Annex 2, paragraph 3, shall apply to the display of the distinguishing sign on vehicles.