The bridge option would allow for two dedicated lanes for bus rapid transit (BRT), in keeping with HRM's regional planning goal of increasing public transit use. The report suggested either a six-lane bridge, costing $1.1 billion, or a four-lane tunnel, costing $1.4 billion, from the southern terminus of the Circumferential Highway to the CN Rail cut on peninsular Halifax. The report shows that cross-harbour traffic is nearing the capacity of the existing two bridges, and concluded that a third harbour crossing would be required by 2016–2026. In February 2008, consultants McCormick Rankin Corporation of Halifax released a report on the need for a third harbour crossing, commissioned by the HDBC. Other than transit buses, no vehicles weighing over 3,200 kg (7,100 lb) are permitted on the Macdonald Bridge vehicles in excess of this weight limit must cross the harbour via the MacKay Bridge. It is only the second time ever that the suspended spans of a bridge have been replaced while being open for traffic during the day the first being the similar Lions Gate Bridge in Vancouver. The only original components are the main cable, the two towers, the anchor piers and cable bents. From 2015–2017, the bridge structure suspended below the main cables was completely replaced, including the floor beams, stiffening trusses, road deck and suspender ropes. The Macdonald Bridge often suffered from traffic problems due to its narrow (40 ft, 12.2 m) width, so a lane addition project was completed in 1999, relocating the pedestrian and bicycle outboard of the main cables. The bridge was designed by Phillip Pratley, a bridge designer also responsible for the Lions Gate Bridge in Vancouver. Macdonald Bridge, known locally as the Macdonald Bridge or the "old bridge", was opened on April 2, 1955.
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