The METRO D Line is a bus rapid transit line in Minneapolis-Saint Paul, Minnesota. The 18.5-mile (29.8 km) route primarily operates on Fremont and Chicago Avenues from Brooklyn Center through Minneapolis to the Mall of America in Bloomington. As part of BRT service, the D Line features "train-like amenities" including improved station facilities, off-board fare payment, modern vehicles, fewer stops, and higher frequency. The current alignment would substantially replace the existing Route 5, the highest ridership bus route in Minnesota.