Ultimately, it was planned to extend Highway 427 north along Indian Line (although a stretch of that road would be retained to maintain access to driveways) to the future Highway 407, where ramps would direct northbound traffic onto Highway 27. An extension north of Dixon/Airport Roads began in 1976 as part of the work to build Highway 409, and it included the construction of the interchange between the two freeways. By the beginning of 1980, this work was completed, and construction was progressing on the section north to Rexdale Boulevard, which opened by the end of the year. In 1982, construction began on the next section of Highway 427, which would extend it to south of Albion Road (which was reached via the northernmost stretch of Indian Line) north of the West Humber River. This project included the extension of Finch Avenue west from Humberline Drive to Steeles Avenue and was completed in late 1984.