Exit fare

The last of the subway exit fares were eliminated from the Boston rail transit lines on December 4, 2006, with the implementation of the CharlieCard (its name a reference to the main character in the protest song).

The system uses an exit fare to distinguish between intra-airport trips, which are free, and connections to the subway and commuter rail, which are not.

[citation needed] On the Washington Metro, riders process their SmarTrip cards for both entering and exiting the system.

The fare is actually deducted from the rider's card upon exiting the system based on the time of day and distance traveled.

Metro Transit in King County, Washington, used a similar system until it was ended on September 29, 2012, as well as TriMet in Downtown Portland, Oregon from 1975 to 1982, when its Fareless Square went to pay on boarding, with transfers as a fare receipt for those leaving the area.

Many lower-volume point-to-point ticket-based transit services use exit fares in one direction, to avoid the expense of maintaining ticket offices at both ends of the line.