No Interstate Highway Program

Suppose Eisenhower's Interstate Highway system does not get past Congress for any number of reasons. How does this change the post-war American economy? Will many still get built more slowly as toll roads or state project, especially east of the Rockies, and does make passenger rail last longer? What does the highway map of 2019 look like?
 
and does make passenger rail last longer?

Passenger Rail was dying with the existing State Highway system, but what really killed it was losing USPS mail contracts to airlines where by 1960 the 10th largest metropolitan areas had 1st class mail treated as airmail, no extra charge, and most all rail contracts were done by 1969, where long distance mail with the new ZIP Codes were also sent by air

That's what was subsidizing Passenger Traffic. Once that was gone, all the Class One Railroads shed Passenger traffic as fast as they were able.
Interstates had little to do with it.
 
Suppose Eisenhower's Interstate Highway system does not get past Congress for any number of reasons. How does this change the post-war American economy? Will many still get built more slowly as toll roads or state project, especially east of the Rockies, and does make passenger rail last longer? What does the highway map of 2019 look like?
Considering the program pretty much gave a ton of free money to build urban freeways, expect the development and deployment of them to be slower (leaving them more of the open to cancellation).
 
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