The highway system had a total length of 1,650 km (1,205 mi) in 2002, virtually all of which (1,628 km/1011 mi) was paved; there were 44,300 passenger cars and 15,600 commercial vehicles registered in 2000. Grantley Adams International Airport, situated 18 km (11 mi) southeast of Bridgetown, is the only airport. Barbados is served by one local and 14 international airlines. There is also a deep water harbor at Bridgetown, with berthing facilities for cruise ships and freighters. In 2002, Barbados had a merchant fleet of 41 ships of 1,000 GRT or over, totaling 629,987 GRT. The Barbados ships registry is the second Ships Registry worldwide that received Lloyd's Registry Quality Assurance approval under the Quality Management System Standard ISO 9002.