On Monday, March 11, 2019 at 8:27:57 PM UTC-5, wrote:

(…)
For all you hear about the "Autobahn," remember that it is regulated quite severely as to what vehicles are allowed, and the total length is only 12,996 km (2017). The US Interstate system reaches 77,840 km (2016) with speed limits from 65-85 MPH. (…)

The length you quote is for the "Autobahn" system in Germany alone. For all the European Union it is 76,823 km (2016 as well), so about equal to the US. Considering intensive expressways construction in Eastern Europe it may very well have exceeded the US length by now (2019).