Scarborough Expressway
The Scarborough Expressway (Gardiner Expressway Eastern Extension) was intended to connect the Gardiner Expressway to Highway 401 at the eastern boundary of Toronto, and one segment was built before public opposition stopped the project.
From a road-transportation standpoint, it remains a major "missing link" in the city's expressway system, as traffic entering Toronto from the east would have travelled directly downtown, as well as serving the south-east area of Toronto. Instead, that traffic is combined with traffic entering from the north along the Don Valley Parkway, where traffic volume significantly exceeds capacity on a daily basis. This has spurred various road advocates to propose new routes to keep the idea alive.
Read more about this topic: Cancelled Expressways In Toronto