There shall be installed in every taxicab a placard encased in a frame which shall display the number of the taxicab, the exact picture of the driver of the taxicab together with the driver’s name, address of business, age and driver’s license number and the taxicab driver’s license. The placard shall be kept and maintained conspicuously within the taxicab at all times when it is being operated. (Code 1981 § 46-41. Code 1995 § 154-68.)