Definition of "autobahn"

On a recent afternoon a work crew and crane were affixing the tall lettering to the side of the team’s new stadium, just off the autobahn in Sinsheim, a few miles from Hoffenheim.

2009 January 22, Nicholas Kulish, “Soccer Titan Raises Profile of Tiny Village”, in New York Times‎

These ant autobahns function much the same as human highways to speed transport of goods and to reduce bumps and potholes in the path.

2016, Justin O. Schmidt, The Sting of the Wild, Johns Hopkins University Press, page 112