- China (Shaanxi) 5.277 km (3.279 mi) 2024 2 Meixian-Taibai
Expressway Heimaguan Tunnel China (Gansu) 5.250 km (3.262 mi) 2024 2 Kangxian-Lueyang Expressway...
- G7521 Chongqing-Guiyang
Expressway left tube: 5,254m,
right tube: 5,241m
Heimaguan Tunnel (黑马关隧道)
Gansu 5.250 km (3.262 mi) u/c 2x2 Kangxian-Lueyang Expressway...