To develop a highway network between Uttaradit to The Phu Du Checkpoint along Highway 117, a large period of time to The Phu Du Checkpoint. Most of the routes are in the hill area. The line is meandering, low speed, and some are dangerous points of frequent accidents. It is not suitable for developing an international network in the future to have cargo vehicles, including high-speed vehicles, which harm both drivers and communities on both sides of the road. Therefore, to develop Highway 117 to suit the international network. Some routes must be adjusted to support high speeds and are more secure in designing route improvements during the big period – Dan Phu Du. The following considerations are as follows:
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