Buses and trolleys operate in the streets of Nashville, with the Metropolitan Transit Authority running several dozen bus routes seven days a week. Bus 34 is the Opry Mills Route that links the downtown district with Opryland. This service operates every 40 minutes daily between around 6.40am and 10.30pm. The Wildhorse Shuttle travels around downtown and stops at most tourist sights. The shuttle runs all hours.For sightseers, the free Music City Circuit bus leaves the Riverfront Station every 15 to 30 minutes between 6.30am and 11pm on weekdays, and from 11am to 11pm on Saturdays, stopping at many popular downtown attractions. There are several taxi companies operating in Nashville, and the major car rental companies offer services. Driving in Nashville's small downtown area can be frustrating, but a hire car is useful for excursions out of town. Visitors staying downtown will find that most attractions are within easy walking distance.