Westbound Highway 401 in Oshawa has reopened following a lengthy closure on Tuesday caused by a multi-vehicle collision involving a commercial truck that resulted in a diesel spill.
It happened near Harmony Road at around 9:10 a.m.
Ontario Provincial Police say three vehicles were involved and that one driver sustained minor injuries.
The truck spilled diesel across all westbound lanes, and a full cleanup was required, says the OPP.
Westbound Hwy. 401 was closed at Courtice Road for several hours for the cleanup. It reopened shortly after 1 p.m.
The cause of the collision is under investigation.
Collison / Hwy Closed:
— OPP Highway Safety Division (@OPP_HSD) April 29, 2026
- #Hwy401 WB at Harmony Rd. #Oshawa
- Time: 9:12 a.m.
- 3 vehicles involved
- One driver transported to hospital with minor injuries.
- A CMV (straight truck) spilled diesel across all lanes.
- #Hwy401 WB is closed at Courtice Rd. for clean up
- Expected… pic.twitter.com/oa5Y3U2lUx
