Taxi owners tampering taxi meters and overcharging their customers is a perennial problem all around the world. This problem is more prevalent in third-world countries. I believe there could be a solution to this menace. Taxi meters should be made using GSM or CDMA technology and should have only the passenger in/out button. On our cell-phones, if the “cell info display” is enabled, the user can see the name of the place being displayed on the screen. As one moves from one place to the other the display also changes thus displaying the name of the place accurately. This technology can be used in taxi meters.
At the start of journey the taxi-driver can press the passenger in button, which would log the start time/place on the server. As the taxi moves from one place to another the route and the time taken gets updated in real-time in the server. When the passenger reaches the destination the passenger-out button which would request the server to process the journey details and display the total journey charges on the LCD available on the taxi-meter. Thus the taxi-owner can never dream of tampering the meter since the charges are sent from the server of the service provider.
In case of traffic snarls, wherein more time would be required to cover the same distance, the taxi driver should be automatically compensated for the lost time and the final charge should include the time-lost charges as in case of normal meters. The new meters should also have a provision to alert the passenger in case the taxi-driver is taking a round-about route to increase his profits thus fleecing the passenger. I hope these new taxi-meters will go a long way in improving the life of taxi-passengers.