issues, the project was delayed by nearly two years. The C$99 million extension opened on September 17, 2014. Future On December 9, 2016, the MTO announced that the segment between Highway 407 and Stouffville Road would be widened from six to eight lanes, with the additional inner lanes to be used as HOV lanes. The project will also add a carpool lot at Major Mackenzie Drive, and replace the 16th Avenue and Rouge River bridges. Construction north of Major Mackenzie Drive started in 2017 and is expected to be completed in 2021, while construction south of Major Mackenzie started in 2019 and is expected to be completed in 2023. Long term proposals by the province call for Highway 404 to be extended to Highway 12, between Sunderland and Beaverton. This extension would follow a new alignment to Port Bolster, east of which the freeway would incorporate the existing two lanes of Highway 48. It has drawn criticism from various environmental groups who claim it will only serve to accelerate urban sprawl north of Toronto. Exit list Notes References External links Video of Highway 404 northbound in Greater Toronto Highway 404 Images @ AsphaltPlanet.ca 04 East Gwillimbury Toronto highways Transport in Aurora, Ontario Transport in Markham, Ontario Transport in Newmarket, Ontario Transport in Richmond Hill, Ontario Whitchurch-Stouffville