Exploring New Haven by foot is enjoyable, particularly in the area surrounding the university. Various walking tours start from the Yale Visitor Center. The downtown area is serviced by a free electric trolley system, operating Monday to Saturday, and departing every 15 minutes or so between late morning and early evening. CTTRANSIT bus service is also available and the network covers most of the city. New Haven has been working to make parking more convenient and there are various off-street lots and garages. A Parcxmart card can be used to pay for metered on-street parking and is very useful for anybody hiring a car to get around New Haven and surrounding areas.