Edit: Found some more info: https://www.electrive.com/2017/12/19/construction-kick-start-first-ehighway-electric-trucks-germany/
Building works have started on Germany’s first electric highway that will see electric trucks run along overhead wires, thus charging dynamically. The technology comes from Siemens.
The state of Hesse has secured the first stretch of the so-called eHighway that will run on the A5 Autobahn between Langen/Mörfelden and Weiterstadt once construction is complete by the end of 2018. The entire project is paid for with 15 million euros from the Ministry of the Environment (BMUB).