"As of 2010, close to 8% of Portland commute trips are bicycle trips, up from 1% 15 years ago. For less than one percent of Portland’s transportation budget, we’ve increased bicycling from negligible to significant. For the cost of one mile of freeway – about $50 million – we’ve built 275 of bikeways. That’s one heckuva bang-for-buck investment!"
https://www.planetizen.com/node/48286oldId.20110304080741118
Biking in Baltimore