1 Hospitalized After Single-Vehicle Hwy. 404 Crash North of Newmarket

1 person is recovering in hospital following a single-vehicle collision on Highway 404 north of Newmarket, Ont. on June 23, 2026.

What Happened?

• The incident took place in the northbound lanes of the highway near Queensville Sideroad East before 12:30am ET on June 23.
• According to Ontario Provincial Police (OPP), 1 individual — it’s unclear if they were the driver — was taken to hospital with serious injuries. Their condition isn’t considered life-threatening.
• Northbound lanes of Highway 404 were closed at Queensville Sideroad East for several hours.

UPDATE (6:40 a.m.): Highway 404 northbound lanes have reopened at Queensville Sideroad East, north of Newmarket following a single vehicle collision. One individual was transported to hospital with what are serious but non-life threatening injuries. ^pia

— OPP GTA Traffic (@OPP_GTATraffic) June 23, 2026

Investigation Updates

The cause of the single-vehicle collision remains under investigation.

🔔 Anyone with information on the incident, including cellphone or dashcam footage, is asked to contact the OPP.

Car Accident Near You? What to Do

Following an incident like this near Newmarket, you should:

1. Avoid the accident area so that officials can safely investigate.
2. Reduce speed appropriately when passing emergency vehicles.
3. Remain vigilant when travelling past the accident area.

Your Rights After a Car Accident Near Newmarket

If you’re injured in a car accident near Newmarket — whether as a driver, passenger, cyclist, or pedestrian — you may be entitled to:

• Accident benefits under Ontario’s Statutory Accident Benefits Schedule (SABS).
• Additional compensation through a personal injury claim against the at-fault driver.

⚠️ IMPORTANT: Ontario imposes strict timelines — some insurer deadlines are days after an accident. Speak to a Newmarket personal injury lawyer at Samfiru Tumarkin LLP before accepting a settlement.