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
Police code that "500" codes are only radio codes that substitute for other code sections. Example: a "503" is not Penal Code section 503 (which is Embezzlement). All of the "500" codes, generally, involve vehicles and are thus grouped together (except 594, which is a legitimate Penal Code). Additionally, "390" (and variants) are also radio codes only (CPC 647(f) is the legally enforced section "public intoxication"). In California, some radio codes in the 400–599 range that refer to vehicle violations are left over from the California Vehicle Code (CVC) which was revised in 1971. Some agencies, such as the California Highway Patrol