Ontario drivers are waking up to a noticeably different Highway 401 on Monday, August 31, 2026. The province has permanently raised the posted speed limit from 100 km/h to 110 km/h on five additional sections of Highway 401 and one section of Highway 403, extending a higher-speed network that has been expanding in stages throughout the summer.
The changes cover major routes through southwestern Ontario, the Greater Toronto Area, Durham Region and eastern Ontario. They are part of a much larger provincial plan to add 938 kilometres of 110 km/h highway in 2026. Ontario says the selected roads underwent technical reviews and were designed to accommodate the higher posted speed. Another major group of highways is scheduled to change on September 30.
Six More Highway Sections Change to 110 km/h Today
The August 31 change affects substantially more than one isolated stretch of pavement. Highway 401 moves to 110 km/h from Merlin Road to Highway 427, from Highway 404 to Highway 35/115, from Cobourg to Colborne, from Sidney Street to the Canadian National Railway overhead bridge in Belleville, and from County Road 38 to Highway 15. Highway 403 is also being increased from Highway 401 to Middletown Line. The new limits are permanent rather than temporary pilot measures.
For drivers, the most important detail is that the higher limit applies only where the new 110 km/h signs are posted. Ontario has been implementing the expansion in stages, meaning neighbouring pieces of the freeway system have not necessarily changed at the same time. The August 31 phase follows increases implemented in June, July and on August 21. The final large phase of the province’s current rollout is scheduled for September 30, when more sections of the 403, QEW and several other 400-series highways are due to change.
A Long Highway 401 Stretch West of Toronto Gets Faster
One of the most consequential changes runs from Merlin Road in Chatham-Kent all the way to Highway 427 in the Toronto area. It closes a large remaining gap in the higher-speed system along southwestern Ontario’s busiest east-west transportation corridor. Previous changes had already established 110 km/h zones farther west, including Highway 401 between Windsor and Tilbury, with another short extension added later.
That matters because Highway 401 is more than a commuter route. It is one of Canada’s central manufacturing and freight arteries, carrying workers, auto parts, consumer products and agricultural goods between communities and major border crossings. A driver travelling from southwestern Ontario toward the GTA will now spend substantially more of the trip on roadway posted at 110 km/h. The change does not guarantee a faster trip during congestion, construction or poor weather, but it raises the legal maximum under normal conditions on a large piece of the corridor where millions of trips are made every year.
Highway 401 Through Durham Gets a New 110 km/h Limit
East of Toronto, the speed limit has also risen on Highway 401 from Highway 404 to the Highway 35/115 interchange. That means the higher limit now extends across Durham Region, where Highway 401 moves through communities including Pickering, Ajax, Whitby, Oshawa and Clarington before reaching the Highway 35/115 split. Local reporting confirmed Monday morning that the new limit was in effect as scheduled.
The change fits together with previous increases farther east. The Highway 401 section from Highway 35/115 to Cobourg had already been designated for 110 km/h, so the August 31 adjustment makes the transition through Durham substantially more consistent. Highway 115 also moved to 110 km/h between Highway 35 and the Parkway Interchange on August 21. For motorists who regularly travel between Toronto, Durham and the Peterborough-area corridor, the result is a highway network with fewer 100-to-110 transitions than before, although posted signs remain the authority and drivers still need to watch for lower limits in construction zones or other restricted areas.
Eastern Ontario Gaps Are Being Filled In
Three additional Highway 401 sections changing today are located farther east: Cobourg to Colborne, Sidney Street to the CNR overhead bridge in Belleville, and County Road 38 to Highway 15 near Kingston. These changes are especially significant because Ontario had already established several 110 km/h sections along the eastern 401, including Colborne-to-Belleville and other portions leading toward Kingston and the Quebec border.
Rather than creating an entirely new higher-speed corridor from scratch, the August 31 changes fill several gaps between previously converted sections. That gradually turns Highway 401 east of Toronto into a much more continuous 110 km/h route. The corridor is also economically important. Ontario government figures have described the eastern Highway 401 as carrying roughly 10,000 trucks and hundreds of millions of dollars in goods on a typical day. Communities such as Belleville, Kingston, Cobourg and Port Hope sit directly along a route that connects the GTA with eastern Ontario, Quebec and international trade routes into the United States.
Highway 403 Is Part of the August 31 Expansion Too
Highway 401 receives most of the attention because of the sheer size of the affected corridor, but Highway 403 is also part of Monday’s change. The posted limit rises to 110 km/h between Highway 401 and Middletown Line. Other stretches of Highway 403 have already been operating at the higher limit, including sections in the Woodstock, Brantford and Hamilton corridor, making today’s move another step toward a more consistent speed regime across the route.
The 403 expansion is not finished, either. Ontario has scheduled another major section, between the Queen Elizabeth Way and Highway 401, to move to 110 km/h on September 30. That means drivers should not assume every part of Highway 403 is already posted at the higher speed merely because the August 31 changes have taken effect. The province’s staged approach makes the signs particularly important during the transition period. A section posted at 100 km/h remains a 100 km/h road regardless of the limit on the section immediately before or after it.
Ontario Is Adding 938 Kilometres of 110 km/h Highway
Today’s changes are part of a much bigger transformation. Ontario announced in June that an additional 938 kilometres of provincial highway would move from 100 km/h to 110 km/h during 2026. Before the latest expansion, the province said 873 kilometres were already posted at 110 km/h. The new program therefore roughly doubles the amount of highway operating at the higher maximum.
The rollout has been deliberately spread across the summer. It began with sections of Highways 401 and 416 on June 26, continued on Highway 402 at the end of July and expanded again on August 21 across sections of Highways 7, 115, 400, 416 and 417. The August 31 changes represent another major block, but the process will not be complete until the September 30 phase. Ontario says that once the full program is implemented, nearly 89 per cent of the relevant provincial freeway network will carry a 110 km/h posted limit, compared with roughly 43 per cent before the 2026 expansion.
The Province Says These Roads Were Chosen for Higher Speeds
Ontario’s move to 110 km/h did not begin in 2026. The province first launched a higher-speed pilot in September 2019 on selected sections of the QEW, Highway 402 and Highway 417. Those corridors were monitored before the government permanently expanded the policy in 2022. Additional sections followed in 2024, and the government says the experience from those earlier increases supported the much larger 2026 rollout.
The Ministry of Transportation says higher limits are being introduced only on roads judged capable of safely accommodating them after technical reviews and, where required, infrastructure improvements. Provincial officials have also said much of Ontario’s freeway system was originally designed to accommodate a 110 km/h operating environment. That does not mean higher speed eliminates risk. Ontario’s own road-safety guidance stresses that crash severity and stopping demands increase with speed. The government’s position is instead that the selected controlled-access highways have physical characteristics suitable for the higher posted maximum while continuing to be monitored for safety performance.
A 110 km/h Limit Does Not Make 120 or 130 Legal
Perhaps the most practical change for drivers is also the simplest: 110 km/h is now the legal maximum on the newly converted sections under ordinary conditions. It is not a new baseline from which motorists are automatically allowed another informal margin. Ontario’s speeding laws continue to apply, and enforcement can take place above the posted limit just as it did when the signs read 100.
The province also maintains a specific stunt-driving threshold that matters on 110 km/h highways. Driving at 150 km/h or more can constitute stunt driving anywhere in Ontario, including on a freeway posted at 110. In practical terms, the absolute 150 km/h threshold remains unchanged even after the posted limit rises. Ontario has emphasized this rule since the original higher-speed pilot. Drivers also remain responsible for reducing speed when conditions demand it. Heavy rain, snow, congestion, construction and poor visibility can make driving at the posted maximum unsafe even when the sign legally allows 110.
Freight Movement Is a Major Part of Ontario’s Case
The government has framed the speed-limit expansion partly as a travel-time and economic measure. Highway 401 is one of Ontario’s most important freight corridors, with provincial data estimating that more than $380 million worth of goods move along parts of the highway every day. In eastern Ontario alone, government transportation projects have cited roughly 10,000 trucks using the corridor daily. That makes even relatively small improvements in predictable travel time important to logistics operators moving goods between manufacturing centres, warehouses, ports and borders.
Ontario says the completed higher-speed network could save nearly 20 minutes on a Sarnia-to-Toronto trip and nearly half an hour between Toronto and Ottawa. Those figures are best understood as potential travel-time savings under suitable traffic conditions rather than guarantees. Highway 401 routinely experiences congestion, collisions and construction that can erase any advantage from a higher posted limit. Still, over long distances, the difference between long sections posted at 100 and 110 km/h can become noticeable when traffic is flowing freely.
Another Large Wave Arrives September 30
August 31 is not the end of Ontario’s speed-limit expansion. On September 30, the province plans to increase limits on another collection of major highways. Scheduled sections include Highway 403 from the QEW to Highway 401, Highway 404 from Highway 401 to Mulock Drive, Highway 406 from Westchester Avenue to Highway 58, Highway 407 from Brock Road to Highway 35/115, and the full lengths of Highways 412 and 418 between Highway 401 and Highway 407.
Three additional QEW sections are also scheduled to change: the Freeman Interchange to Highway 403, Concession Road to McLeod Road, and Mountain Road to Jordan Road. When that final 2026 phase is finished, Ontario’s 110 km/h policy will have shifted from a relatively limited collection of pilot corridors to the predominant speed limit across much of the province’s freeway system. For now, however, the safest assumption remains the simplest one: motorists should follow the number on the sign in front of them, because the transition is still underway.
