High Quality Content by WIKIPEDIA articles! National Highway 73 (NH 73) is a National Highway in Northern India that connects Roorkee in Uttarakhand to Panchkula in Haryana. The highway is 188 km (117 mi) long. It covers a distance of 108 km (67 mi) in Haryana, 59 km (37 mi) in Uttar Pradesh and 21 km (13 mi) in Uttarakhand.