Transport within the Caribbean islands of Saint Kitts and Nevis (one country, a two-island federation) includes normal road traffic, public buses, taxis, ferries, airports, and one unusual railway. Basseterre is the hub for all major roads on the island of St. Kitts. Charlestown is the equivalent hub for Nevis. Driving is on the left. The speed limit in settled areas is 25 mph, with special caution to be taken around school zones. In rural areas the speed limit is 40 mph. The grand total of roadways on St. Kitts and Nevis is 320 km. In 1999 it was estimated that 136 km were paved, and 184 km were unpaved. Bus service is via privately owned minivans. They’re a cheap way to get around. St Lucia’s main road forms a big loop around the island, and buses stop at all towns along the way. They’re frequent between main towns and generally run until around 7pm, except on the busy Castries–Gros Islet corridor where they run until after 10pm. With the exception of services in the north, very few run on Sunday.