The Lopper Road Tunnel is a tunnel in central Switzerland. The tunnel connects Hergiswil in the canton of Nidwalden with Alpnach in the canton of Obwalden, and forms part of the A8 motorway. The tunnel was opened in 1984, and is 1,590 metres (5,220 ft) long. The tunnel has two lanes (one in each direction), and there is no central reservation.