Peer-to-peer ridesharing or carpooling might just be the answer. In recent years, mobile apps like Uber and Lyft have gained popularity as a greener and cheaper alternative to driving or taking a taxi.

Phototaxis (by light) Rheotaxis (by fluid flow) Thermotaxis (by changes in temperature)

Outside of busy times, Uber's base fares are said to be cheaper than taking a black cab. But for a passenger to be able to take a ride at the base fare, the demand has to be extremely low.

The taxicab is named after the taximeter, an instrument invented by Wilhelm Bruhn in 1891 that automatically recorded the distance traveled and/or the time consumed, thus enabling the fare to be accurately measured. The term cab derives from the cabriolet, a two-wheeled, one-horse carriage often let out for hire.