High Quality Content by WIKIPEDIA articles! National Highway 30 is a National Highway entirely within the state of Bihar, India that links NH 2 to NH 19. This 230 km (140 mi) long stretch passes through Mohania, Kochas, Dinara, Bikramganj, Arrah, Koilwar,(bridge across Son River), Maner, Maner Sharif, Danapur, Patna, Fatuha and Bakhtiarpur in Bihar.