on 31 May 2014, connecting Edinburgh Airport on the western edge of the city, with Haymarket, Princes Street, St Andrew Square and York Place in the city centre. A further extension to the redeveloped waterfront areas of Leith, Granton and Western Harbour has been postponed due to costs. The planning, design and construction of the tram network was originally overseen by the City of Edinburgh Council's wholly owned company Transport Initiatives Edinburgh. The Scottish Parliament gave legislative consent to the parliamentary bills, required for the project to commence, in March 2006. Construction of the network was originally scheduled to start in spring 2007, beginning with the repositioning of the network of gas and water mains that lie under the proposed routes. Work finally started in July 2007. The scheme had been estimated to cost about £592m, with a contribution of £450m-£500m from the Scottish Executive and £45m from City of Edinburgh Council. In 2006, there was a controversy about the construction of the tram network, with worries over escalating costs and disruptions due to construction. Following a vote in the Scottish Parliament on 27 June 2007, it was agreed to continue with the tram project - despite the opposition of the SNP minority government. Road network The Edinburgh City Bypass (A720) skirts the southern fringes of the city. The road was constructed between 1981 and 1990 and opened to motorists in sections. The road is one of the main trunk roads in east central Scotland linking vitally important routes such as the M8, the main route west to Glasgow, the A1, one of the two primary routes south from Scotland to England, and the M9 to Stirling. The City Bypass is linked by the A902 to the A90 leading north out of the city. Edinburgh itself is the hub of the A-road numbering system within Scotland, and many radial routes lead into and out of the city. Routes radiating from Edinburgh are as follows (in a clockwise direction): A1 - to Berwick-upon-Tweed and over the border into England, continuing all the way to London. A68 - to Jedburgh then over the border into England as far as Darlington. A7 - to Galashiels and Hawick then on across the border into England as far as Carlisle. A701 - to Dumfries. A702 - to Carlisle (via A74(M)). The A702 itself continues beyond Abington to St John's Town of Dalry in Dumfries &