The second tunnel, called the Refaim tunnel based on the nearby Refaim Valley and passing under Har Gilo and Beit Jala, is 900 m long, making it the longest road tunnel in the West Bank. The tunnels are linked by the West Bank's highest and longest bridge, crossing the Walaja Valley. Route 60 was a central scene of violence during the al-Aqsa Intifada, which was in part defined by the thousands of shooting attacks on its Israeli traffic, including hundreds of casualties. The Israeli Army, in response, has fortified various sections with anti-sniper walls and had established checkpoints along the route. The Tunnels Highway came under particularly heavy assault during the shooting on Gilo neighborhood since it lies between Gilo and Beit Jala. The concrete barriers employed on other dangerous stretches of road were too heavy to be supported by the bridge, and so a barrier of bulletproof composite armour similar to that employed on Merkava tanks was constructed. The road was also the site of terrorist attacks in June, August 2010, and June 2015.