> one side would chirp while the other would listen and confirm it. Ostensibly, this meant you were in the right vehicle. In Finland this is solved by giving t

> one side would chirp while the other would listen and confirm it. Ostensibly, this meant you were in the right vehicle. In Finland this is solved by giving the person reserving the taxi a two-digit code that you repeat to the driver to confirm that you were the requester. It works great unless you're so loaded you can't remember a two-digit number.