The A 44 motorway, a few sections of which are still to be completed, links the German-Belgian border with the city of Kassel. The design works for the extension to Herleshausen are currently underway. Hessen Mobil Straßen- und Verkehrsmanagement is responsible for the design and construction of the A 44 motorway extension. ILF Consulting Engineers have recently been entrusted with the design of the operation and safety equipment for the Hirschhagen twin-tube road tunnel which forms part of the A 44 and is currently under construction.
The tunnel with a length of 4.2 km will comprise 15 cross passages and 7 lay-bys.The tubes will be ventilated via a longitudinal ventilation system in combination with a single-point extraction in the middle of the tunnel. The extraction will be realised via a shaft with a depth of 80 m and a diameter of 7 m. Operations buildings will be provided at both tunnel portals and at the ventilation shaft.