What is the double certificate for recruiting drivers?

Driver's license (issued by Traffic Management Office) and operation qualification certificate (issued by Transportation Bureau)

You only need a driver's license to drive a private car or a car for your own use, not for commercial profit; If you want to drive a car that is used to pick up business for profit, it is called an operating car (divided into passenger transport and freight transport), and you need a driver's license to obtain an operating qualification certificate (also called a qualification certificate or employment certificate, which was issued in the registration examination of the Transportation Bureau). The double certificate required for recruiting drivers refers to the driver who holds the above two certificates at the same time.