 Construction to twin the highway began in 1983, following the completion of a culvert over the east branch of the Etobicoke Creek; the interchange with Clark Boulevard was built at the same time. The City of Brampton constructed the West Drive Extension, between Orenda Road and Tomken Road, as a detour in 1983. The following year, contracts were awarded to build the two structures over the Canadian National Railway south of Orenda Road, as well as an interchange at Queen Street; the former was completed by the end of the year while the latter took until late 1985. Construction of the interchange at Bovaird Drive began in 1985 and was completed the following summer. With the construction of each interchange, the future northbound lanes of the freeway were constructed and opened to two-way traffic. By 1988, two lanes were open between Steeles Avenue and Bovaird Drive.
