High Quality Content by WIKIPEDIA articles! National Highway 1D (NH 1D), also known as Srinagar-Leh Highway, is a National Highway entirely within the state of Jammu Kashmir in North India that connects Srinagar to Leh in Ladakh. It is one of the only two roads that connect Ladakh with the rest of India, the other being Leh-Manali Highway. The Srinagar-Leh Highway was declared as National Highway in 2006.