Hyderabad sits at the junction of three National Highways linking it to six other states: NH-7 runs 2,369 km (1,472 mi) from Varanasi, Uttar Pradesh, in the north to Kanyakumari, Tamil Nadu, in the south; NH-9, runs 841 km (523 mi) east-west between Machilipatnam, Andhra Pradesh, and Pune, Maharashtra; and the 280 km (174 mi) NH-163 links Hyderabad to Bhopalpatnam, Chhattisgarh NH-765 links Hyderabad to Srisailam. Five state highways, SH-1, SH-2, SH-4, SH-5 and SH-6, either start from, or pass through, Hyderabad.:58

How many national highways form a junction in Hyderabad?