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The opening of the Boryeong Undersea Tunnel directly connected Boryeong, South Chungcheong Province, and Anmyeondo Island, significantly reducing the travel time that used to take more than two hours. As a result, the number of tourists visiting the Anmyeondo area and the demand for transportation are increasing significantly. This design aims to improve traffic flow by unifying the number of lanes in areas with an imbalanced number of lanes to four lanes in order to resolve difficulties in handling the greatly increased traffic demand caused by the mixing of two-lane and four-lane roads in the Taean-gun, Chungcheongnam-do and Boryeong-si areas of National Route 77. To achieve this, among the design alternatives, the 854-meter road from Wonsan Intersection in Boryeong to Wonui Intersection in Boryeong was selected for widening and paving. To determine the number of lanes, traffic volume was analyzed using the Korea Highway Corporation's (KHCS) program. Based on a Level of Service, the number of lanes was determined to be four in each direction. The basic design of the road pavement cross-section was performed using the existing AASHTO 72 & 94 standards, and the cross-sections of the surface, base, subbase, and subgrade were determined. Furthermore, the Korean Pavement Design Program (KPRP), developed domestically, was used to conduct a pavement performance evaluation to select the pavement thickness. The performance evaluation results showed that fatigue cracking, permanent deformation, and smoothness index were all deemed adequate. The basic road alignment, including horizontal and vertical alignments, was reviewed using a RP program. Earthwork volumes were determined based on the RP program's alignments, and cut and fill volumes were adjusted accordingly, appropriately incorporating these into the road design sections. Based on the road design data, the construction elements required for road construction were analyzed and used to develop basic progress diagrams. Construction costs were estimated using the Asung Cost program, resulting in a per-kilometer construction cost of KRW 351,967,000.
