Each vehicle for hire shall have prominently displayed a fare rate card visible to all passenger seats, and each driver shall provide a copy of the fare rate card to a passenger, when requested. A passenger of a taxi may request from the driver an estimate of the fare to be charged, and the driver may provide such an estimate based on the fares displayed on the rate card. The driver shall then charge a fare not to exceed the estimate given plus the rate card fare for one-half mile.