History's first taxi meter

A very interesting description of history's first Taxi Meter in first century Rome in this nytimes article:

>> The use of metering to measure distance traveled by a vehicle for hire was nothing new. It’s been traced to first century Rome, to a device that dropped a stone into a receptacle underneath a carraige at every 1,000 paces. At the end of the ride, the driver computed the fare by counting the
stones.