San Boldo Pass

The San Boldo Pass is a small mountain pass in Veneto between the towns of Trichiana and Tovena in the Cison di Valmarino region over a distance of 17 km.

The pass lies at the southern edge of the Alps and connects the Val Belluna with the Val Mareno over a height of 706 m. The mountain pass is called the SP 635 and only one lane is passable, the traffic is regulated by several sets of lights. There is a speed limit of 30 km/h and a height limit of 3.2 m, after buses were repeatedly stuck in the tunnel. There are five tunnels blasted into the rock with hairpin turns or loops, and six bridges.

Source: Wikipedia