"Autobahn speeds" refers to the high speeds typically reached on Germany's autobahn, a highway system known for not having specific speed limits. It suggests traveling at very fast speeds with minimal restrictions. Full definition
You can really appreciate the German engineering when you drive the car at autobahn speeds on U.S. highways. (autolist.com)
You'll hear the roar of the engine and feel the vibrations of the steering wheel as you hit autobahn speeds on a twisting alpine road — all from the safety of your sofa. (fortune.com)
I'd argue that the PCCB ceramic brakes are even more impressive than the explosive acceleration, hauling the 1.6 - tonne missile from autobahn speed to pedestrian speed for turns one and two with real authority, straight as an arrow. (paultan.org)