An international airport may have two one-way loop roads, one for departures and one for arrivals. It may have a direct rail connection by regional rail, light rail, or subway to the downtown or central business district of the closest major city. The largest airports may have direct connections to the closest freeway. There will be car rental agencies and taxi companies at the terminals. The Hong Kong International Airport has ferry piers on the airside to connect with ferry piers across the border.