Do you ever want to lock up your bike on a rack, and can't because that rack simply isn't there? There are probably other people who feel the same way. This is an example of a place where a bike rack would be a great idea. Keep track of the places you find bike racks fit to exist... but don't. This places can be in front of a park, near a grocery station, at the bus stop. There may be reasons why a rack cannot be installed in a particular place. While there are no set regulations, a sidewalk may not be wide enough for a bike rack. The City of Boston is also working with historical districts to determine regulations for bike racks in these areas.