Freedom of movement, mobility rights, or the right to travel is a human rights concept encompassing the right of individuals to travel from place to place within the territory of a country, and to leave the country and return to it. The right includes not only visiting places, but changing the place where the individual resides or works. Such a right is provided in the constitutions of numerous states, and in documents reflecting norms of international law. For example, Article 13 of the Universal Declaration of Human Rights asserts that: "Everyone has the right to freedom of movement and residence within the borders of each state." "Everyone has the right to leave any country, including his own, and to return to his country." Some people and organizations advocate an extension of the freedom of movement to include a freedom of movement – or migration – between the countries as well as within the countries. The freedom of movement is restricted in a variety of ways by various governments and may even vary within the territory of a single country. Such restrictions are generally based on public health, order, or safety justifications and postulate that the right to these conditions preempts the notion of freedom of movement. Common restrictions Restrictions on international travel on people (immigration or emigration) are commonplace. Within countries, freedom of travel is often more limited for minors, and penal law can modify this right as it applies to persons charged with or convicted of crimes (for example, parole, probation, registration). In some countries, freedom of movement has historically been limited for women, and for members of disfavored racial and social groups. Circumstances, both legal and practical, may operate to limit this freedom. For example, a nation that is generally permissive with respect to travel may restrict that right during time of war. Restrictions may include the following: national and regional official minimum wage tariff barriers to labour-market entry (free movement or migration of workers); official identity cards (internal passports, citizenship licenses) that must be carried and produced on demand; obligations on persons to register changes of address or of partner with the state authorities; protectionist local/regional barriers to housebuilding and therefore settlement in particular districts; trespassing into another individual's property. motor vehicle normative road and highway design, in which pedestrian and bicycle access is severely restricted or absent Freedom of movement between private properties In some jurisdictions,