Arabic is the official language of Saudi Arabia and the primary language used in all dealings and public transactions. English serves as an informal second language in the Kingdom and is spoken by a large section of its society. All road signs are bilingual, showing information in both Arabic and English.Arabic is the official language of Saudi Arabia and the primary language used in all dealings and public transactions. English serves as an informal second language in the Kingdom and is spoken by a large section of its society. All road signs are bilingual, showing information in both Arabic and English.Arabic is the official language of Saudi Arabia and the primary language used in all dealings and public transactions. English serves as an informal second language in the Kingdom and is spoken by a large section of its society. All road signs are bilingual, showing information in both Arabic and English.