This is something that is well-known in planning circles. In Seattle there have been a huge number of road diet (widening the sidewalk and redesigning the road for slower traffic speeds) + protected bike lanes coming online. Pedestrians benefit from this, too, from the increased safety and the other pleasant effects of traffic calming. Here's a map: http://seattlecitygis.maps.arcgis.com/apps/webappviewer/inde...