It doesn't have to be expensive. In Ghent they recently did it on a budget: https://www.youtube.com/watch?v=sEOA_Tcq2XA https://www.youtube.com/watch?v=sEOA_Tcq

It doesn't have to be expensive. In Ghent they recently did it on a budget: https://www.youtube.com/watch?v=sEOA_Tcq2XA https://www.youtube.com/watch?v=sEOA_Tcq2XA The principle is simple: In designated spots, prevent through traffic for cars while allowing bicycles to go through. This massively reduces car traffic on those streets. In Ghent they did that by simply placing obstructions on the road that only bicycles can maneuver around. Once more people are cycling, you'll have increased political will to spend money on more ambitious infrastructure such as in Amsterdam.