Cities are pouring millions of dollars into making safe bike lanes to enable more of us to use a bicycle for transportation. But there's an underappreciated barrier for many people -- there's no safe place to store their bike at home. This can be a huge problem for millions of people who live in smaller apartments and flats where bike parking wasn't considered when it was built, and for millions of people in newer buildings where expensive car parking is often mandated but storage for bikes is not considered at all.