A taximeter shall be equipped with a primary indicating element.
Except when a taximeter is being cleared, the primary indicating elements shall be susceptible to advancement only by the rotation of the vehicle wheels or by the time mechanism.
Except when a taximeter is being cleared, indications of fare and extras shall be visible at all times.
When a taximeter designed to calculate fares upon the basis of a combination of mileage traveled and time elapsed is operative with respect to fare indication, the fare-indicating mechanism shall be actuated by the mileage mechanism whenever the vehicle is in motion, at such a speed that the rate of mileage revenue equals or exceeds the time rate, and may be actuated by the time mechanism whenever the vehicle speed is less than this and when the vehicle is not in motion. Means shall be provided for the vehicle operator to render the time mechanism either operative with respect to the fare-indicating mechanism.