First published Oct 29, 2026, 2:44:15 PM UTC · Last updated Oct 29, 2026, 2:44:15 PM UTC

Collision closes all lanes on Highway 77 in Ontario

A collision was reported on both directions of Highway 77 between Mersea Road 9/County Road 14 and Mersea Road 8, with all lanes closed. Severity was listed as unknown.

At a glance

Affected location: Highway 77, Ontario

Illustrative image: Highway 401 approaching Harmony Road and Bloor Street exit in Oshawa, Ontario. — Adam Moss from Tonawanda, New York, United States/Wikimedia Commons, CC BY-SA 2.0

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Why it matters

The reported full closure affects both directions of the named highway segment.

Location

Highlighted marker: this event.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 8/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 1/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 5/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

Ontario 511 Traffic Events accidentsAndIncidents on HWY 77 (Both Directions)Contains information licensed under the Open Government Licence – Ontario (https://www.ontario.ca/page/open-government-licence-ontario). Source: Ontario 511. Information is provided “as is”; actual roadway conditions may differ. No endorsement by Ontario 511, MTO, or the Government of Ontario is implied. Usage terms

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