Viaduct Šumljak

The Razdrto-Vipava expressway as it passes through Rebernice is one of the most demanding sections on the Slovenian motorway network due to the steep and unstable slopes of cliff called Nanos. There are many road structures on this section, the longest of which is the Šumljak Viaduct.

A sloping viaduct consists of two separate structures that bridge a steep slope relatively low to the ground, at a height of up to 20 meters. The construction of the viaduct was extremely demanding, from a technical standpoint, due to the slope of the terrain, the S-shaped axis, and the geological characteristics of the ground. To enable safe traffic in a demanding and variable area (wind, cold, snow, changing profiles), the entire route through Rebernice is boldly designed. The viaduct also crosses a very large and deep slow landslide (moving at a rate of 8mm/year), so to ensure safety, constant monitoring of the landslide and the viaduct structure is carried out.