Avenue to Woodlawn Road began in August 1974. It and the final section south to Highway 401 were opened on November 7, 1975. Initially, the road featured no interchanges. However, the MTO has long-intended to upgrade the route to a freeway. Construction of the Wellington Avenue interchange began in October 1998; it opened in July 2001. On April 30, 2012, construction began on the Laird Road interchange. It partially opened on the week of November 11, 2013, and was fully opened on November 29, 2013, in a public ceremony attended by local officials as well as Guelph MPP Liz Sandals. Caledonia Bypass In 1976, a corridor study was completed on Highway 6 between Port Dover and Hamilton, indicating a need for a bypass of Caledonia due to the aging multi-span bridge over the Grand River, to improve capacity to the developing areas of Nanticoke near Lake Erie, and to reduce the high-volume of truck traffic passing through the town. Construction began in late 1979 on structures to cross the Grand River and to carry rail lines and three crossroads over the bypass. The bypass was completed in the fall of 1983. The old route through Caledonia is now known as Argyle Street. Downloading and changes since On April 1, 1997, Highway 6 was decommissioned south of Hepworth to Highway 21. The entire length of Highway 70 was subsequently renumbered Highway 6 to rectify the discontinuity. On the same day, the section between the southern terminus at former Highway 24 to the west side of the Lynn River. These reduced the length of Highway 6 from to . A new segment of Highway 6 was opened to the southwest of John C. Munro Hamilton International Airport in 2004. This building of this route had been planned since the construction of the Caledonia Bypass in 1983. However, concrete plans were not announced until January 1993. However, it had already drawn criticism due to an old-growth forest located in the path of the route. The planned highway would cost a projected $100 million. However, these plans never came to fruition, and by 1997 a new, shorter route was in the planning stages. Construction of the $33 million route was announced on May 26, 2000 by Transportation Minister David Turnbull, and began in July 2003. The new route was opened on November 26, 2004. The section through Hamilton at the time followed Upper James