Well I mean we modeled our interstates after hitlers roads....
Just forgot to add that pinch of kraut efficiency.
No, not really.
The concept for controlled access high speed highways was something that had been proposed by a number of different individuals as far back as the early 1900s.
The Long Island Motor Parkway, a privately built road that opened in 1908, was the first of what could be considered to be a "modern" highway. It had limited access points (which differ from an interstate's controlled access points), modern-style roadbed construction, banked turns, planned drainage, and guide rails. The later Bronx River Parkway, which opened in the late 1920s, was the first US road built to use divided median construction.
The Autobahn's first stretch opened in 1913, and in the 1920s Italy opened the first median-divided highway (but it was only 1 lane in each direction). When Hitler came to power in the 1930s he engaged in many public works projects, including expansion of the Autobahn system.
The first controlled access high speed road in the United States that would provide a large part of the pattern for what would become the interstate system was the Pennsylvania Turnpike, which opened the first section between Carlisle and Irwin in October 1940.
By 1940 the concept of a high speed interstate highway system was already firmly rooted in the minds of many people in the United States (and had been for a long time) and it was being pushed hard by men like Thomas MacDonald and Herbert Fairbank. In many ways those two men were more responsible for the creation of the Interstate system than Eisenhower.
There's no doubt that the Autobahn did influence people like Eisenhower and Gen. Lucius Clay (whose helped formulate Eisenhower's proposal that would become the Interstate Highways bill in the 1950s) as well as many, many others who were responsible for designing and building the system, but so did a LOT of other roads around the world.