St. Helena has 138 kilometres (86 mi) — 118 kilometres (73 mi) paved and 20 kilometres (12 mi) unpaved — of roads. The only major harbour is James Bay at Jamestown, Saint Helena, which has customs and immigration buildings. There is no merchant marine. The Royal Mail Ship RMS St Helena runs between Saint Helena and Cape Town on a five-day voyage, also visiting Ascension Island and Walvis Bay, and occasionally voyaging north to Tenerife and to Portland in the United Kingdom. She berths in James Bay, Saint Helena, approximately 30 times per year. RMS St Helena was due for decommissioning in 2010, but her service life has been extended to February 2018. A minibus offers a basic service to carry people around Saint Helena, with most services designed to take people into Jamestown for a few hours on weekdays to conduct their business. Car hire is available for visitors.