Bike lanes in our state are being added mostly as afterthoughts, long after the buildings and streets have been built so they are often not very well-protected from traffic. Some are right beside very busy multi-lane highways while others they did try a bit to protect, so they put them closes to the curb and put street parking next to them and then the very busy streets. It’s not ideal, but they also mark in green where the cars & bikes cross paths supposedly to alert the drivers & bikers to be extra alert.
When I went to school in Eugene, OR, (late 1970s) we had some bike paths only in parks where vehicles were not allowed. It was wonderful and you could bike to the mall or just around the park. I really enjoyed biking there. Also, there weren’t as many cars and they didn’t seem to drive as fast.