● FRI, MAY 1 · TODAY · PLAN AHEAD ●★
416TRAFFIC
ConstructionThu, Apr 30, 2026 – Fri, May 15, 2026HWY 400 (Southbound)

Nightly Construction on HWY 400 Southbound between DUNLOP STREET / SIMCOE ROAD 90 and DUNLOP STR…

Construction · Thu, Apr 30, 2026 – Fri, May 15, 2026
★ IMPACT 5/5 · ★ SOURCE-BACKED CLOSURE RECORD

★ Quick facts

Location
At DUNLOP STREET / SIMCOE ROAD 90
Start date
Thu, Apr 30, 2026 · 8:00 PM
End date
Fri, May 15, 2026 · 6:00 AM
Lanes affected
2 Alternating Lane(s)
Severity
Severe
Source
Ontario 511Event ID 239340

What's affected

HWY 400 (Southbound) at DUNLOP STREET / SIMCOE ROAD 90 is impacted by construction work. Expect impact to 2 Alternating Lane(s).

Suggested detour: Highway 27 and Yonge Street are the practical alternates south of King City; both are heavily congested in peak.

Same-day events

Plan ahead

Read next

★ RoadHighway 400 statusSegment-level closures, long-running restrictions, and upcoming work.read →★ DayTraffic on Thu, Apr 30, 2026Same-day events and other road restrictions around this closure.read →★ ClosuresAll road closuresBrowse active and upcoming construction records.read →