Driving between France and Italy this year? You may be forced take a detour as the Mont-Blanc Tunnel, which links the two countries beneath the Alps, is closing for 15 weeks for renovation work. Between 2 September and 16 December, a 600-metre stretch of the 11-kilometre tunnel will be completely reconstructed. During this time, the Tunnel du Mont-Blanc will be closed to traffic. Alternative routes are available but they will likely add to your travel time. Here’s how to plan your Europe road trip around this autumn’s closure. Why is the Mont-Blanc Tunnel closing?Opened in 1965, the Mont-Blanc…