Public transport is not very reliable in Memphis and the most efficient way to cover the sprawling city is by renting a car, although you may find traffic congestion on major roads. The city is simple to navigate and parking is generally easy to find. To hire a car drivers must be 21 years old, and most agencies have higher rates for under-25s. Some require an International Driving Permit as well as a valid driver's license.Public transport is available, consisting of slow and infrequent buses, but there are also shuttle buses that operate around the main attractions in the city centre, which visitors may find more convenient. The famous vintage electric trolleys are a popular way for tourists to get around the city. Taxis are also available and must be booked by phone.