Halton's finished plan would widen James Snow Parkway to six lanes from Britannia Road to Highway 401; comments close October 16

What Halton is proposing

Halton Region has placed the Environmental Study Report for James Snow Parkway (Regional Road 4), from Britannia Road (Regional Road 6) to just south of Highway 401, on the public record for a 30-day review that runs from September 16 to October 16, 2026. The study, part of the Region's North Halton Coordinated Municipal Class Environmental Assessment, recommends widening the 5.8-kilometre corridor to six lanes, three in each direction, within a 47-metre right-of-way.

Today the road is two lanes, one each way, from Britannia Road to Derry Road, and four lanes from Derry Road to just south of Highway 401, according to the report. It says that without improvements, northbound traffic between Clark Boulevard and Derry Road is projected to exceed capacity in the morning peak hour by 2031, and several intersections are expected to approach capacity. The widening is also meant to make room for future transit priority infrastructure.

The report says construction staging and traffic management plans will be developed during detailed design, that short-term lane closures may be allowed during off-peak hours, and that work should be coordinated with the Town of Milton, Milton Transit and GO Transit. It does not give a construction start date. Subject to comments and approvals, the Region says it intends to proceed to detailed design and construction of the preferred design.

Regional Road 25 north of Britannia

Two days earlier, on September 14, Halton Region filed the Environmental Study Report for Regional Road 25 from Speers Road in Oakville to Derry Road in Milton, with comments due October 14. It recommends widening the road from four to six lanes north of Wyecroft Road and a consistent 60 km/h posted speed limit along the corridor. In Milton, it proposes a multi-use path on the east side from Louis St. Laurent Avenue to Derry Road and a widened bridge over Sixteen Mile Creek. The report estimates the Britannia Road to Derry Road segment at about $47 million, and says it is planned as the second of three construction stages, after Speers Road to Highway 407, though the phasing may be refined in detailed design.

How to comment

• James Snow Parkway: written comments to Halton Region's project team by October 16, 2026, through the contact listed in the Notice of Completion.
• Regional Road 25: written comments to the project team at RR25MCEA@halton.ca by October 14, 2026.
• Both notices say a request to the Minister of the Environment, Conservation and Parks for a higher level of study will be considered only on grounds related to constitutionally protected Indigenous and treaty rights.