The Highway 400–404 Connecting Link is a proposed 16.2 kilometre, four-lane controlled access highway that will provide an east-west connection between Highway 400 in Bradford West Gwillimbury and Highway 404 in the Town of East Gwillimbury.

The Highway 400–404 Connecting Link is intended to alleviate congestion on east-west corridors across the Holland Marsh and to provide an alternative path from eastern Toronto and eastern Greater Toronto Area to Barrie and the rest of the Simcoe area. The Connecting Link would provide a key link between the Simcoe Area and York Region and would aid in economic development of the Simcoe Area and York Region.

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