Art. 63 Ordinance of September 5, 1979, on Road Signage (OSR) - Principles

Additional information regarding a signal is displayed on a supplementary plaque in a rectangular shape. The background is white, and the inscriptions and, if applicable, the symbols are black. In the case of matrix signals, the background may be black and the symbol white. Generally, supplementary plaques should be placed under the signals; Art. 101, para. 7, is reserved. When it comes to indication signals (chap. 5), with a blue background, simple additional information (e.g., about distance or direction) is provided, if necessary, in white characters or by means of a white symbol. The directives on the supplementary plaques are as imperative as the signals themselves.