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The Provincial Highways of Khyber Pakthunkhwa consists of all public highways maintained by the Pakistani province of Khyber Pakhtunkhwa. The Pakhtunkhwa Highways Authority under the Department of Transportation maintains over 2,388 kilometres (1,484 mi) of roadways organised into various classifications which crisscross the province and provide access to major population centres. All provincial highways in Khyber Pakthunkhwa are pre-fixed with the letter 'S' followed by the unique numerical designation of the specific highway (with a hyphen in the middle), i.e. S-1, S-2, S-3, etc. These are not to be confused with national highways which are federal roads maintained by the Government of Pakistan and the National Highway Authority.