In its modern form, a gated community is a form of residential community or housing estate containing strictly controlled entrances for pedestrians, bicycles, and automobiles, and sometimes characterised by a closed perimeter of walls and fences. Gated communities usually consist of small residential streets and include various amenities. For smaller communities this may be only a park or other common area. For larger communities, it may be possible for residents to stay within the community for most day-to-day activities.