Ontario’s construction season is in full swing, and for truck drivers hauling across the province this summer, knowing where the highway slowdowns are is essential. At Marshall Truck & Trailer Repair, we know time is money.
Ontario Summer Traffic Report: Major Construction Projects Slowing Truck Routes
Here’s your go-to guide for major construction zones across Ontario in 2025:
GTA & 400-Series Highways
Highway 401 – Keele to Hwy 400 & Hwy 410
- Bridge rehab & express lane reductions east of Keele Street (Wilson Ave, Bathurst, Dufferin)—same zones as last year, continuing into summer and through to year-end - learn more here.
- Eastbound 403 reduced lanes between Winston Churchill Blvd and Hurontario Street, through the end of the year - details here.
Highway 404 Widening
- Highway 404 lanes widening from Highway 407 to Stouffville Road, including new HOV lanes.
Highway 400–Essa Road Interchange (Barrie)
- Ongoing ramp and bridge work at Essa Road, with detours affecting the southbound on-ramp, is expected to wrap up late summer 2025. Read more about it here.
Eastern Ontario Corridors
Highway 401 East – Stormont, Dundas & Glengarry- Multiple bridge rehab projects, culvert replacements, and resurfacing in the Stormont, Dundas & Glengarry region, underway through 2025.
Highway 417 – Ottawa Area
- Ongoing bridge replacements and interchange improvements will continue until November 2025.
Regional & Municipal Projects
Uxbridge / Durham Region
- Regional Highway 47 (Pefferlaw River bridge): lane restrictions from June 9 to August 26, 2025.
- Regional Road 1: full closures from April 14 to July 9, 2025, for sewer and road work – details for both here.
Muskoka Area (Bracebridge, Huntsville, Lake of Bays, etc.)
- A series of resurfacing, culvert, and bridge rehab projects across Muskoka roads 2, 4, 6, 8, 9, 10, 23 and more are expected through summer and fall 2025, mostly with single-lane restrictions during working hours. Learn more here.
Southwestern Ontario & County Works
Oxford County
- Bridge rehab on Oxford Road 6 starting June 30, 2025 (expected completion November 2025).
- Resurfacing on Oxford Road 37 & culvert work on Roads 16, 25, 119—through July–November 2025, with closures/detours – details here.
Northumberland County
- Multiple county road and bridge maintenance projects are scheduled for 2025; expect delays. Find specifics here.
Tips for Truckers on the Road
| TIP | WHY IT MATTERS |
| 1. Check Ontario 511 daily | Live updates on closures, camera views, and alternate routes |
| 2. Plan hauls early/late outside peak work hours | Most delays occur during 7 am–5 pm |
| 3. Stick to low-priority lanes when possible | Especially around bridge/shoulder work zones |
| 4. Watch for detours in rural zones | Especially in Uxbridge, Oxford, Muskoka. |
| 5. Stay on top of your rig’s service | Construction zone stress, bumps, and stop-and-go traffic make maintenance key |