A taximeter is a mechanical or electronic device installed in taxicabs and auto rickshaws that calculates passenger fares based on a combination of distance travelled and waiting time. It is the shortened form of this word that gives the "taxi" its name. The modern taximeter was invented by German Wilhelm Bruhn in 1891, and the Daimler Victoria—the world's first meter-equipped (and gasoline-powered) taxicab—was built by Gottlieb Daimler in 1897. Taximeters were originally mechanical and mounted outside the cab, above the driver's side front wheel. Meters were soon relocated inside the taxi, and in the 1980s electronic meters were introduced, doing away with the once-familiar ticking sound of the meter's timing mechanism. In some locations, taxicabs display a small illuminated sign indicating if they are free (available). In Argentina, this sign is called a "banderita" (little flag), a carryover term from the days of mechanical taximeters, in which a little flag was turned to wind up the mechanism. The flag would be hidden at the start of a trip and moved to the visible position at the end.
Accessories and Features
Taximeters can include several accessories, or act as components in larger dispatching/control systems. Features include:
- Ticket/receipt printer
- Fraud control and prevention (on the part of the owner or operator), through the impression of control tickets or computer monitoring. Additionally, taximeters are often visually sealed by a municipal weights and scales authority after initial calibration.
- Radio communication, allowing trip status to be monitored by a dispatcher or supervisor.
- Dispatching of trip assignments through radio or data systems.
- Interaction with GPS systems to assist with dispatching & to provide security.
- Seat sensors that detect the presence of a passenger (to prevent a cab from carrying fares without activating the taximeter)
- Credit or prepaid card support
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