Expansion of County Road BGL 10: Modern Infrastructure with a View of the Surrounding Area

Between Vachenlueg and Thundorf in the Berchtesgadener Land district, County Road BGL 10 underwent extensive upgrades over a length of approximately 3.1 kilometers. In addition to widening the roadway, SWIETELSKY also constructed a continuous sidewalk and bike path running alongside the road. The construction project combines high-performance transportation infrastructure with sophisticated engineering and earthwork, as well as targeted measures to protect nature.

More Space for Traffic and Bicycles
As part of the expansion, the roadway was widened from its original width of approximately 5.30 to 5.50 meters to a consistent 6.00 meters. At the same time, a 2.50-meter-wide sidewalk and bike path was constructed along the entire length of the project. This created the conditions for a more efficient and safer connection between Vachenlueg and Thundorf.

The construction period, which lasted approximately 16 months, was characterized by extensive earthwork: A total of approximately 60,000 m³ of earth was moved. 

Challenging Engineering and Earthwork

The topographical conditions along the route posed special challenges for the construction. Several corrugated steel culverts with spans of approximately 2.80 meters and lengths ranging from about 15 to 21 meters were constructed.

Various methods were used to stabilize the slopes. These include back-anchored shotcrete structures with natural stone walls in front of them, as well as natural stone retaining walls and reinforced earth structures.

Another component of the project is the new pedestrian and bicycle underpass in Ottmaning. The structure, approximately 11.6 meters long, was built as a reinforced concrete structure and allows for safe crossing of the county road.

Drainage as a Key Component

The management of surface runoff and slope runoff also played a central role in the expansion. Along the entire length of the project, the drainage system was rebuilt or modified. In addition, three open stormwater retention basins were constructed.

These measures ensure that runoff can be collected, diverted, or retained in a controlled manner—an important consideration, especially given the challenging topographical conditions along the route.

Integrating Infrastructure and Nature Conservation

During construction, special attention was paid to protecting native wildlife. A guidance system approximately 591 meters long, comprising a total of eight amphibian tunnels, was created for migrating amphibians. This allows the animals to safely cross under the road at appropriate locations.

In addition, ecological protection areas along the route were taken into account during the construction project.