Atlanta's trains and buses reach most parts of the city, but they are not always the most convenient way to get around, and services are limited outside of the immediate city limits. The MARTA (Metropolitan Atlanta Rapid Transit Authority) network is inexpensive, safe, and well-integrated, but travel can be slow. A one-way MARTA pass, good for travel anywhere on the system, costs around $2.50. There are weekly, weekend, and visitor's passes available for various rates.Atlanta is a car-dominated city, so there is plenty of parking, especially at tourist sights. But traffic on the freeways and in the city centre can be very busy, particularly during rush hours. During conventions and big sporting and entertainment events, it is easier to use public transport to get around. 'The Buc' is operated by BATMA; it is a free shuttle service connecting the two MARTA rail stations with many hotels, shopping areas and businesses in the city.Taxis are available, but it is easier to order one by phone than to find one on the street; they can also be found in taxi stands around the city. Visitors should be cautious of unlicensed taxis, and women travelling alone at night should order taxis by phone.