If you want a good impression of the type of shift that it's going to take to make U.S. streets more bike friendly, you can watch the great YouTube channel NotJ

If you want a good impression of the type of shift that it's going to take to make U.S. streets more bike friendly, you can watch the great YouTube channel NotJustBikes, which overviews some of way the Netherlands' infrastructure is built from the ground up to be not car dependent. While the investment required to build physical bike infrastructure is small compared to other infrastructure projects, building cities for bikes requires overcoming political opposition and indifference, rethinking zoning laws and other harmful, bureaucratic rules and slowly reshaping cities to not rely on cars. It's not simply a matter of chucking a line of paint on a 35 mph road and then complaining when cyclists don't use it.