Oakville — A collision on the westbound lanes of Highway 403 near Dundas Street East left a 78-year-old woman dead Thursday evening after her SUV, reported to be broken down in a live lane, was struck by an approaching tractor-trailer, Ontario Provincial Police said.
What happened
Provincial police responded to the two-vehicle collision at about 9:30 p.m. Thursday. According to Sgt. Kerry Schmidt of the OPP, officers had received earlier reports of a vehicle stranded in a live lane of traffic before the tractor-trailer struck the disabled SUV.
There were two people in the SUV: the 78-year-old driver, who was pronounced dead at the scene, and a 67-year-old female passenger, who was taken to hospital with injuries described by police as non-life-threatening. The driver of the tractor-trailer was not injured, Schmidt said.
Road closures and response
Emergency crews closed the westbound lanes of Highway 403 at Dundas Street East while first responders and collision investigators attended the scene. The closure disrupted traffic through the area overnight; police later said the highway was reopened by Friday morning.
| Event | Approximate time |
|---|---|
| Collision reported / Emergency response | About 9:30 p.m., Thursday |
| Highway 403 westbound reopened | Friday morning (after 4 a.m., according to police) |
Investigation and appeal
OPP investigators are working to determine the full circumstances of the crash. Sgt. Schmidt has asked anyone who may have seen the broken-down vehicle on the highway or captured dash-cam footage of the incident to contact the Burlington OPP. The investigation remains ongoing.
"Before any emergency response could attend, the vehicle was struck by an approaching tractor trailer,"
— Sgt. Kerry Schmidt, Ontario Provincial Police (posted on social media)
- Fatality: 78-year-old female driver of the SUV, pronounced dead at the scene.
- Injuries: 67-year-old female passenger taken to hospital with non-life-threatening injuries.
- No injuries reported: Driver of the tractor-trailer.
For Oakville residents who travel the 403, the incident is a stark reminder of the dangers posed when vehicles stop in live lanes on high-speed highways. Highway 403 is a major arterial route that carries substantial commuter and commercial traffic through Halton Region, connecting communities across the western Greater Toronto Area. Even brief stops in moving lanes can create hazardous situations, giving following motorists and heavy trucks little time to react.
Local emergency planners and traffic safety advocates often point to several practical measures motorists can take if their vehicle becomes disabled on a busy highway: where possible, move the vehicle to the shoulder or an emergency turnout, switch on hazard lights, set up warning triangles or flares if it is safe to do so, and exit the vehicle away from traffic. If stranded, drivers should call for help immediately and, if safe, remain at a distance from moving lanes until assistance arrives.
At this stage, investigators have not released further details on how the SUV came to be stopped in the live lane or whether mechanical failure, driver choices, or other factors contributed to the collision. Anyone with information or footage is asked to contact the Burlington OPP. Local residents with dash-cam video of the stretch of Highway 403 near Dundas Street East around 9:30 p.m. Thursday are especially urged to come forward to assist the ongoing inquiry.
The death will be handled through standard coroner and police procedures. As the community absorbs the loss, municipal and provincial authorities continue to remind drivers of the importance of safe breakdown practices on high-speed roadways.
