The Highway Code Great Britain version, available in English and Welsh, applies to England, Scotland and Wales, but regional specific signs such as driver location signs in England or bilingual signs in Scotland and Wales are not covered. The Northern Ireland version, available in English and Irish, applies to Northern Ireland. Costing one penny, the first edition of the Highway Code was published on 14 April 1931. It contained just 18 pages of advice, including the arm signals to be given by drivers and police officers controlling traffic. The second edition, considerably expanded, appeared in 1934, and now illustrated road signs for the
Validly published name Validly published name In botanical nomenclature, a validly published name is a name that meets the requirements in the "International Code of Nomenclature for algae, fungi, and plants" for valid publication. Valid publication of a name represents the minimum requirements for a botanical name to exist: terms that appear to be names but have not been validly published are referred to in the "ICN" as "designations". A validly published name may not satisfy all the requirements to be "legitimate". It is also not necessarily the correct name for a particular taxon and rank. Nevertheless, invalid names ("nomen invalidum", "nom. inval.")