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The Saudi government has launched a tender process to build a new metro system in the capital, Riyadh, in an effort to ease congestion on the city's gridlocked roads, Saudi Gazette has reported. The Arriyadh Development Authority (ADA) invited international consortia to prequalify for the project, which it wants to be completed in four years. "ADA invites global consortia specialised in the production and supply of rolling stock, control and telecoms systems as well as metro tunnelling, civil, mechanical and electrical works to prequalify for Riyadh metro project," the authority said. Saudi Arabia has limited public transport facilities and Riyadh suffers grinding congestion for much of the day and into late evenings.