Urban transit systems are currently not viable in most American suburbs, with the reason being that residences there are too thinly spread-out. So the car remains king. And development around the car compromises the public health, safety and welfare and the environment.
However, many cities (such as Washinton D.C. and Portland, OR) have implemented regional transit systems anyway and have found that, once they are in place, new, higher-density, mixed-use and walkable developments are spurred at the corresponding planned stops. These developments are called Transit Oriented Developments (or TOD's) and other walkable developments can be linked to these TOD's with bike routes and shuttles.
Also, locations of future transit lines can be anticipated. In Troy and Ann Arbor, MI they have been anticipated along existing rail lines. With bike and shuttle connections to other walkable developments, planning ahead for transit becomes possible. This is the Campbell Planning Mission.
Form-based codes are a type of zoning regulation intended to result in desirable building form, walkability, and a mix of uses. In form-based codes, building form is regulated to support walkable environments similar to traditional towns and cities. Thus, Form-Based codes are employed in TOD's and other walkable developments. But, in order to remain consistent with existing planning legislation in most states, zoning (including Form-Based Codes) needs to be preceded by planning. Thus, at Campbell Planning, form-based coding begins within the planning stage.