The Nansan (Nantou-Sanjiao) Highway overpass spanning the Guangzhou-Macao Expressway, located in Zhongshan's Sanjiao Town, has been upgraded and reopened to traffic.

The main overpass has been widened to 3 lanes in each direction, with 2-lane auxiliary roads on each side and dedicated non-motor vehicle lanes, creating physical separation between motorized and non-motorized traffic.

The overpass is a key route to National Highway 228 and the Guangzhou-Macao Expressway, and is flanked by major logistics hubs including SF Express and China Post.