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Interstates that changed the most from planning stage to building stage

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I-75 was to end in Tampa. I-4 was to run from St. Pete to where it is now.

The former got extended to Miami and the latter got truncated to Tampa.

I-70 west of Denver was initially planned to head to Salt Lake City (either via US 40 or US 6), before getting shifted to today's route to provide a more direct routing for Denver to Las Vegas/SoCal traffic.

Max Rockatansky:
Planned I-5 shifting west from US 99 onto Legislative Route Number 238 was a big one.


--- Quote from: 1995hoo on June 27, 2023, 07:18:40 PM ---I-95 in New Jersey, perhaps?

--- End quote ---

Along with I-95 in DC and Boston.

South of Albert Lea, MN, I-35 was supposed to follow US 69 southwestward into Iowa which is reflected on some official Minnesota highway maps in the late 1950s and early 1960s. Mason City, Iowa successfully lobbied for that part of the interstate to be routed along US 65 instead so they could be closer to the route.


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