The part you are missing, like most people who aren't used to exercise and see city planning in a car-centric way, is that a bicycle can go at a serious speed i

The part you are missing, like most people who aren't used to exercise and see city planning in a car-centric way, is that a bicycle can go at a serious speed in a city. Bike lanes in sidewalks work in beaches because bikers tend to drive at a comfortable cruising speed. Daily commuters usually bike in the ~15-25mph range in a city (and a lot faster in suburbs and country roads); that speed is dangerous for pedestrians. You are also disregarding turns and intersections, where it's much more convenient to stop as little as possible. The solution to bike lanes is physically separated lanes that don't give lazy car drivers free parking space and don't penalize cyclists for traffic, but still allows them to move to the roads when there aren't many cars as in [1]. [1] https://assets.publishing.service.gov.uk/government/uploads/system/uploads/image_data/file/49647/S113_Salford_Liverpool_Street_trial_site_stop_line_approach_960x640.jpg https://assets.publishing.service.gov.uk/government/uploads/...