Originally Posted by
cyccommute
A 3000 mile "bicycle interstate" without bridges would cost around $900,000,000. Add in roughly 1000 bridges and the cost balloons to $1.9 billion.
It'll never happen...at least not in the US.
And keep in mind if a nationwide effort that you'll need more than one, because good luck getting folks on board with something that runs through and benefits only states that are nowhere near them.