Public transportation fares are organized under various kinds of fare structures which price the service based on criteria such as distance traveled, demand for the service, and time of day.
Flat fare The simplest fare structure is a
flat fee with a fixed price for a given service. For example, the
Los Angeles Metro charges $1.75 for a standard single ride on its buses or rail services. A flat fee may be charged for a single ride, or for an unlimited number of rides within a single time period such as 90 minutes, a day or a week.
Zone-based fare Zoned-based fare systems charge a traveler a price that depends on the number of geographically determined fare zones that are expected to be traversed in a given trip. Examples include the
London Underground ticketing system and the integrated ticketing system of transportation authorities such as the
Verkehrsverbund Berlin-Brandenburg or the
Autoritat del Transport Metropolità in the Barcelona metro area.
Transfer fare Transfer fare systems charge a fare depending on previous trips. Timed transfers and pre-booked combined transfers are examples of that.
Distance-based fare Some transportation systems charge a fare based on the distance traveled between the origin and destination stations or stops of a service. Such a system may use an
exit fare at the destination station in order to correctly charge the customer based on the distance traveled. Examples include the
Beijing Subway and the San Francisco Bay Area's
BART system.
Subscription fare Certain transportation systems have subscription passes that provide an advantage over paying fares individually.
Variable fares Certain services, often long-distance modes such as high-speed trains, will charge a variable fare with a price that depends on complex factors such as how early the ticket is bought or the demand for the service. A prominent example is
airline ticketing. Other examples include high-speed rail services such as
Eurostar and regional buses such as
Megabus. ==Farebox==