The official languages in Wales are English and Welsh. English is spoken by almost all people in Wales and is the de facto main language, with the local dialect being Welsh English. However, Wales is officially bilingual, with 20% of the population having some knowledge of the Welsh language according to the 2001 census, although few residents of Wales are monolingual in Welsh. The Welsh Language Act 1993 and the Government of Wales Act 1998 provide that the Welsh and English languages should be treated on a basis of equality. Public bodies are required to prepare and implement a Welsh Language Scheme. Thus the Welsh Assembly, local councils, police forces, fire services and the health sector use Welsh as an official language, issuing official literature and publicity in Welsh versions (e.g. letters to parents from schools, library information, and council information). All road signs in Wales should be in English and Welsh, including both versions of place names where names or versions exist in both languages e.g. Cardiff and Caerdydd.