Phahonyothin road (Northern line), Highway No. 1 by land, starting at the victory monument, Bangkok Ayutthaya via pathum Thani province. Chainat, kamphaeng Phet, Tak, Lampang, Nakhon sawan, saraburi, Lopburi, and ends at Amphoe Mae Sai, Chiang Rai province including approximately 1005 km.
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