The bigger difference is between single people and families. If you have an infant or disabled family member, transportation through biking isn't practical. If

The bigger difference is between single people and families. If you have an infant or disabled family member, transportation through biking isn't practical. If you have two kids at different schools who both need to arrive between 8am and 8:15 while you need to be at work before 9, then biking isn't going to cut it. If you coach your son's baseball team and need to carry a ton of gear, you need a car. However, if you're only responsibility to is to get yourself to work before 10am, then biking is great! I can understand the frustration from people who need to drive when new infrastructure geared towards biking seemingly comes at the expense of drivers. Ex. Market St, the main street in downtown SF, is scheduled to be closed to private vehicles and only used by bikes, taxis and buses.