Courtesy picture of Wikipedia
1) Nakhon Sa Wan-Lampang-Payao-Chiang Rai
along national highway #1 (Phahol Yothin Road). Then turn left to highway #32 (Asia Route) at Wang Noi district of Phra Na Khon Si Ayuddhaya province passing Sing Buri province, Chai Nat province, Nakhon Sa Wan province either Kamphaeng Phet province or Tak province respectively. Reaching to Lampang province so going ahead to Payao province from there you will reach to Chiang Rai province. Total distance is 830 kilometers.
2) Nakhon Sa Wan-Pitsanulok-Phrae-Chiang Rai
driving the same way of above choice until reaching Nakhon Sa Wan province altered to use the highway #117 going ahead to Phitsanulok province. Then turn to drive highway #11 so far as passing Uttaladit province till reaching Den Chai district. And then, turn to highway #101 (Phrae-Nan) driving along this route till reaching Rong Kwang district. After that turning to highway # 103 gearing along the road for meeting the Pahol Yothin Road (highway #1) at Ngao district. Aim to Payao province then driving straight on to Chiang Rai province respectively. Total distance is 804 kilometers.
3) Nakhon Sa Wan-Lampang-Chiang Mai-Chiang Rai
Driving along Pahol Yothin Road (highway #1) to Lampang province. Altered to drive highway #11 (Lampang-Chiang Mai), infact passing Lampoon province also, from there reaching Chiang Mai province. After that turning to drive highway #118 (Chaing Mai-Chiang Rai) passing Doi Saket, Wiang Pa Pao then reaching to Chiang Rai province respectively. Total distance is 900 kilometers.
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