Regular buses operated by different companies link all parts of Oxford to surrounding towns and villages. The city centre is largely pedestrian-friendly and most streets are open to one-way traffic; therefore a vehicle is more a hindrance than a help. Parking can be difficult as well. There are several park-and-ride car parks in the surrounding area, which are the best option for those arriving by car. Sightseeing is best accomplished on foot or by making use of a 'round the city' hop-on, hop-off bus tour. Wide-ranging cycling tracks run through Oxford, offering a more active, scenic alternative for seeing the city.