The final rules regulating the switch from zone taxi fares to time-and-distance meters are now in effect, leaving cab drivers less than two months to buy and install their meters before the crackdown begins.

The emergency rules, published Friday in the D.C. Register, reintroduce the extra passenger surcharge, which Mayor Adrian Fenty had proposed to eliminate, raising it to $1.50 per additional rider. They also increase the capped cost of an intra-District ride from $18.90 to $19.