404 widening should *finally* finish up this year. It's the last of the bunch of large HOV widenings in the GTA the Liberals funded in the dying days of their government (410, 401 widening, 427 widening, 404 widening).
The big spending is on the 400 though, yes. 2023 will have the already underway widening between King Rd and Highway 9 continue, and work will start to widen the literally just widened stretch from Major Mackenzie to King Rd by adding another general purpose lane. The widening south of Major Mackenzie to Langstaff, adding an HOV lane, will begin in 2024. All three of these project are scheduled to wrap up at once at the end of 2025 with a 10-lane cross section south of Highway 9.
A whole lot of other work is happening on the 400 though in 2023, including:
1. Anne St Bridge Replacement completion
2. Sunnidale Rd Bridge Replacement start
3. Essa Rd Interchange Replacement
4. Innisfil Beach Rd Interchange Replacement
5. North Canal Rd Bridge Replacement (this will finally close the Canal Rd at-grade intersection with the 400)
2024 will bring more major spending on the 400:
1. Widening from Langstaff to King Rd
2. Dunlop St Interchange Replacement
3. Highway 88 Interchange Replacement
4. Bayfield Road Interchange Replacement
After these projects wrap up, the entire 400 will be "ready" to be widened. I expect that funding will come through very, very soon for that..
Elsewhere in the province, another 401 widening south of London will start, extending the 6-lane section south to Highway 4 and replacing the second-last cloverleaf interchange on a 400-series highway, and the Highway 3 widening mentioned above will start construction.