Construction began in earnest in April 2007, with the first foundations for the up to 18m high piers of the southbound part of the new viaduct. A bracing structure under the section carrying over the railway line was established over Easter 2009, and a 140m long, 800 ton heavy launching gantry was erected above the Newmarket skyline, which moved into place new sections and stabilised parts to be demolished (with the demolition considered the most difficult part of the project). The southbound addition was to be finished by the end of 2010, while the northbound section was expected to take at least until March 2012. During construction, sight screens reduced visual distractions of passing drivers, though the construction still required narrowing of the traffic lanes and reduction of the maximum speed on the viaduct to 70 km/h. A number of temporary support girders around the structure were also required to safely cater for the stresses put on the structure while parts of it were demolished and rebuilt.