Except for passengers requesting the share-a-ride program, no passenger shall be grouped with another passenger without the expressed consent of the first and second passengers who enter the taxicab; provided, however, that in time of emergency or during inclement weather, the taxicab business licensee may authorize taxicab drivers to group passengers without the consent of the first and second passengers who enter the taxicab. (Code 1981 § 46-42.4. Code 1995 § 154-124.)