Through field surveys of the route, we identified the construction characteristics of the Old Road Galjae on the Honamdaero, which is one of the nine major roads of the Joseon Dynasty. The measured length of the route, consisting of 80 surveyed points, is 2,071.3m, with the Jeongeup section being 780m and the Jangseong section being 1,271.3m. The route follows the terrain and includes hairpin curves, while using stone-piling methods on steep slopes to construct paths of both dirt and stone. The width of the route ranges from a minimum of 1.2m to a maximum of 6.0m, but the majority of it is between 1.4~2.0m. The gradient ranges from 0~2.0% on the longitudinal slope and from 0~4.0% on the cross slope, which is suitable for cart traffic and natural drainage without a side ditch. Based on the measured results of the route, this study has depicted the planimetric alignment of the Old Road Galjae on aerial photographs.