Halton finishes its Regional Road 25 study: six lanes from Wyecroft Road to Derry Road, about $250 million, built in stages
The Environmental Study Report for the 16-kilometre corridor between Speers Road in Oakville and Derry Road in Milton recommends widening to six lanes with walking and cycling paths. Construction depends on Regional Council approval and funding.
The details
What the study recommends
Halton Region has completed a Municipal Class Environmental Assessment for Regional Road 25 from Speers Road in Oakville to Derry Road (Regional Road 7) in Milton, a corridor of about 16 kilometres. Its Environmental Study Report, dated September 2026, recommends widening the road from four lanes to six and rebuilding rural sections with curbs and gutters.
- Six (three each way) from Wyecroft Road to Derry Road; the existing four lanes stay between Speers Road and Wyecroft Road
- Generally 47 metres, up from 35 to 42 metres today; extra land may be needed at intersections for turn lanes
- A consistent posted limit of 60 km/h, down from 60 to 80 km/h today
- Sidewalks, multi-use paths or cycle tracks, depending on the segment
- The Highway 407 underpass and the Sixteen Mile Creek bridge would be widened
- About 16 kilometres
The report says the widening would generally be done equally on both sides of the existing centreline. Where that would hit sensitive features, the road would shift instead. Near Bowes Cemetery at 6317 Regional Road 25, which is on the Town of Milton's Heritage Register, the road would be realigned west between north of Whitlock Avenue and Louis St. Laurent Avenue.
Why Halton says it is needed
The report says that without improvements, intersections along the corridor will run over capacity as Oakville and Milton grow. It tested four options for 2031: leaving four lanes, six general lanes, four general lanes plus two high-occupancy-vehicle and transit lanes, and four plus two transit-only lanes. It found the four-plus-two high-occupancy-and-transit option performed best, and that most intersections would operate poorly if nothing were done.
Regional Council's November 2025 servicing strategy lists high-occupancy-vehicle lanes and transit signal priority on Regional Road 25 for 2037 to 2041, and the road is on the Region's 2051 transit priority network as a future bus rapid transit corridor. The Region says that timing will be phased and coordinated with the local municipalities.
Cost and order of construction
- About $92.4 million, planned as the first stage
- About $47.0 million, planned as the second stage
- About $110.9 million, planned as the third stage, including the Highway 407 interchange and the Britannia Road intersection
- About $250.4 million
The report says phasing is meant to line up with development along the corridor and may be refined in detailed design. Construction staging and traffic management plans are to be developed then. The preliminary staging approach keeps two lanes each way in urban sections by shifting traffic toward the median and building one side of the road at a time, which would close the sidewalk or path in the work zone, and the report says access to adjacent properties and businesses is to be maintained.
Where it stands
Halton put the report on the public record for a 30-day review that ran from September 14 to October 14, 2026. The Region says that, subject to the comments received and necessary approvals, it intends to proceed to detailed design and construction of the preferred design. The report adds that the project continues to detailed design and then construction subject to Council approval and funding, and that the plan may be refined in detailed design.