"We’ve put almost all of our resources into roads," LaHood says. "If the commitment when President Eisenhower signed the interstate bill had been to high-speed inner-city rail, we'd be in the same position Europe and Asia are in today."
LaHood is also floating the idea of a nationwide interstate biking system — the two-wheel equivalent of Eisenhower’s highway system.
In getting ready to post this I looked around and found that a group has been preparing for a nationwide bicycle route and even has a numbering system in place.
From the NYT: Highway Group Approves Basic Plan for a Network of Bicycling Routes
The group is the Adventure Cycling Associaton and they have frequent updates at their site for the U.S. Bicycle Route System
Here's a proposed map:
Via BikingBis: Uneven support for U.S. Bicycle Route System