The National Highway (NH-10) starting from its junction with NH-27 near Siliguri in the State of West Bengal connecting Sivok, Kalimpong near N.H-10 and terminating at Gangtok in the State of Sikkim.
Rongbull-Ghoom
Sevoke-Guwahati
Porbandar-Silchar
Gangtok-Nathula