A taxi rank (also called a taxi stand or "piatsa" in some regions) is a designated area on a street or at a major transportation hub where taxicabs are permitted to wait for passengers. The term "rank" refers to the orderly queue system; drivers must join the back of the line and wait their turn, while passengers are expected to take the taxi at the very front of the line. This system is designed to provide a fair and organized way for drivers to find work without "cruising" and causing traffic congestion, and to give passengers a guaranteed location to find a licensed vehicle. In many cities, specific rules govern these ranks—for example, a driver cannot leave their vehicle unattended in a rank. Understanding the "rank" etiquette is helpful for travelers at airports or train stations to ensure they are following local norms and supporting licensed operators.