A restricted-license cab refers to a taxi that is only permitted to operate in certain areas, often limited to airport or downtown districts. Other terms commonly used for restricted-license cabs include limited-zone taxis, airport shuttles, and downtown cabs. Additionally, some cities may refer to these taxis as special purpose vehicles or permit taxis. Regardless of the term used, restricted-license cabs generally operate under stricter regulations than other taxis, with limitations on where they can pick up and drop off passengers. These restrictions are meant to mitigate traffic congestion in busy areas while providing reliable transportation options to passengers in need.