National Highway 510 (India)
National Highway 510, commonly referred to as NH 510 is a national highway in  India. It is a spur road of National Highway 10. NH-510 traverses the state of Sikkim in India. The highway is being maintained by the NHIDCL. Route 
Singtam - Tarku - Ravangla - Legship - Gyalshing. Junctions  

  Terminal near Singtam. 