Chains, Closures and TONU: Canadian Winter Operating Decisions for 2026-27
BC chain rules, Quebec tire exemptions, Ontario closures and federal adverse-driving HOS limits, plus how to price weather delays, TONU and layover this winter.
The load was booked out of Calgary for a Monday 07:00 delivery in the Lower Mainland. On Sunday afternoon a commercial chain-up goes active on a mountain pass, then the highway closes. The driver sits six hours, chains up, and arrives at 14:00. The consignee has given the door away and offers Wednesday. Four questions now land on four desks. Who pays the layover? Is anyone owed a TONU on the Wednesday reload the truck can no longer make? Was the six-hour wait on-duty time? And does the driver, paid by the mile, earn anything for the day?
Most Canadian freight businesses answer those questions one email at a time and lose money on the ones nobody wrote down. The rules that frame the answers are specific, mostly provincial, and in places narrower than dispatch assumes. Here is what is in force for 2026-27, and what to decide before the first real storm.
One caution on forecasts. The U.S. Climate Prediction Center's October 8, 2026 ENSO discussion put the odds of a strong-to-very strong El Niño through January to March 2027 above 83%, with impacts more likely but "not guaranteed." A mild seasonal tilt does not remove closures. Plan for the storm, not the average.
The regulated calendar, province by province
Jurisdiction | Regulated winter period | What it means for heavy trucks |
|---|---|---|
British Columbia | October 1 to April 30 (March 31 on select non-mountain routes) | Carry chains; comply with active chain-up signs |
Quebec | December 1 to March 15 | Winter tire mandate does not apply to heavy vehicles or out-of-province plates |
Ontario | No winter tire or chain mandate | Risk is closures and time to bare pavement |
Federal HOS (extra-provincial) | Year-round | Adverse driving extension is capped and conditional |
British Columbia: chains are a carrying obligation, not a judgment call
The provincial government's winter driving pages state that drivers must obey winter tire and chain signs from October 1 to April 30, with requirements ending March 31 on select highways that do not run through mountain passes or high snowfall areas. Commercial vehicles with a licensed gross vehicle weight (LGVW) of 11,794 kg or more, which covers tractor-trailers, must carry steel chains on most major highways. Trucks between 5,000 kg and 11,794 kg must carry chains or acceptable traction devices unless they run winter-rated tires with the three-peaked mountain and snowflake or M+S symbol.
The Motor Vehicle Act Regulations spell out placement by configuration. A tractor with one trailer and a tandem drive, for example, needs chains on two tires on each side of one drive axle, or one tire on each side of two drive axles.
According to the province's enforcement page (updated November 24, 2025), the fine for a commercial vehicle not carrying chains when and where required is $196, and bypassing an active chain-up area is $598. The RCMP can also turn all vehicles away when conditions are unsafe.
What changed recently: B.C. Reg. 235/2025, deposited December 15, 2025, lets the transportation minister authorize specific carriers to use traction devices instead of chains on heavy commercial vehicles, including multi-trailer combinations. Authorizations are carrier-specific, can be limited by vehicle, highway and device type, can require training and reporting, and expire no more than one year after taking effect. A sign or public notice can still override them.
Carriers holding an authorization should treat its vehicle list and expiry date as compliance data: a unit outside it is a unit without chains. Brokers should make "chains on board" a tender-time confirmation on October to April BC freight, not an assumption.
Quebec: the exemption that trips up mixed fleets
Quebec's winter tire regulation under the Highway Safety Code requires winter tires on Quebec-registered motorized road vehicles from December 1 to March 15, but expressly excludes heavy vehicles, tool vehicles and farm machinery. The government's guidance also excludes trailers and vehicles registered outside Quebec, and sets the fine for non-compliance at $200 to $300.
So the tractor is not the exposure. Everything around it is: Quebec-plated pickups, service vans and light straight trucks below the heavy-vehicle threshold must be on winter tires by December 1.
Ontario and the Prairies: plan around closures and recovery time
Ontario does not mandate winter tires or chains for trucks. Its winter risk is time: how long a corridor stays closed or snow-covered, and how long after a storm it returns to bare pavement. The province's winter maintenance page (updated July 23, 2026) sets the targets:
Freeways and urban highways: bare pavement within 8 hours of the end of a storm.
Trans-Canada Highways 11 and 17: within 12 hours, four hours faster than the previous standard.
Major highways: within 16 hours. Intermediate highways: within 24 hours.
Ontario met its bare pavement standard 96% of the time in 2025-26 against a 90% target, but the average hides the north: Sault Ste. Marie reached 88% with a Winter Severity Index of 105, and Cochrane 90% with an index of 99. On Highway 11 or 17 lanes, plan transit as the storm plus up to 12 hours of recovery.
Under section 134 of the Highway Traffic Act, police may close a highway, and no one may drive on it in intentional disobedience of the closure signs. A driver who pushes through to save an appointment is breaking the law.
On the Prairies, Alberta 511, the Saskatchewan Highway Hotline and Manitoba 511 publish closures. In every province, the official road report with a timestamp is your best evidence when you invoice layover or defend a late delivery.
Federal HOS: "adverse driving conditions" is narrower than dispatch thinks
For extra-provincial carriers, the Commercial Vehicle Drivers Hours of Service Regulations (SOR/2005-313, current to September 30, 2026) define adverse driving conditions as snow, sleet, fog or other adverse weather or road conditions that were not known, and could not reasonably have been known, to the driver or the dispatching carrier immediately before the driver began driving. A storm on Sunday's forecast does not qualify for a Monday dispatch.
Where the condition does qualify, section 76 lets a driver south of 60°N extend the 13 hours of driving time and reduce the 2 hours of daily off-duty time only if driving, on-duty and elapsed time are not extended more than 2 hours, the driver still takes 8 consecutive hours off duty, and the trip could have been completed under normal conditions without the extension. The driver must record the reason in the record of duty status.
Three more provisions matter in winter:
Waiting is on duty. On-duty time includes servicing and conditioning the vehicle and waiting at an en-route point because of an unplanned occurrence. A driver parked at a closure, outside the sleeper berth, is burning the 14-hour on-duty limit and 16-hour window.
Shippers and consignees are named. Section 4 bars any carrier, shipper, consignee or other person from requiring or allowing a driver to drive when that would likely jeopardize safety.
The penalty is time. An out-of-service declaration runs 10 consecutive hours for breaching the daily driving or on-duty limits in section 12, and 8 hours for breaching section 13, which includes the 16-hour elapsed limit.
Intra-provincial carriers fall under provincial hours rules, so confirm the equivalent provision where you run.
Writing weather into the rate confirmation
No federal or provincial rule sets TONU, layover or weather-delay pay. It is contract. In Ontario, the uniform conditions of carriage for general freight (O. Reg. 643/05) are deemed part of every contract of carriage, and three of them shape winter disputes:
Article 5: the carrier is not liable for loss, damage or delay caused by an act of God, among other exceptions.
Article 6: no carrier is bound to deliver in time for any particular market, or other than with due dispatch, unless that is specifically endorsed in the contract of carriage and signed by the parties.
Article 16: if goods cannot be delivered through no fault of the carrier, the carrier must notify the consignor and consignee and may store the goods subject to a reasonable storage charge.
A guaranteed appointment and any weather penalty only exist if you wrote them in. Clauses for October to April freight:
Define the trigger. Tie weather events to an official source, such as an active chain-up or a posted closure on a government road report, captured with a timestamp.
Separate TONU from cancellation. A truck dispatched and turned away because the shipper closed for weather is a TONU. A load cancelled before dispatch because the lane is closed is not. Price them differently and say so.
Layover clock. State when layover starts after a weather-caused missed appointment, the daily rate, and whether it applies when the consignee, not the road, forces the rebook.
Rescheduled appointments. Specify who rebooks, within what window, and that a weather reschedule is not a carrier service failure.
Chain-up time. Decide whether chain-up time on BC mountain lanes is built into linehaul or billed as an accessorial, and put it on the tender.
No-pressure language. Mirror section 4: nothing in the agreement requires a driver to operate in conditions likely to jeopardize safety.
Driver pay when the truck is not moving
For federally regulated employee drivers, the Motor Vehicle Operators Hours of Work Regulations define working hours as all hours from the start of the shift until the driver is relieved of job responsibilities, excluding authorized en-route meals and rest, stops for illness or fatigue, sleeper-berth rest as a team driver, and rest in a hotel or similar place. Federal guidance sets highway-operator overtime after 60 hours a week. A driver stuck at a closure and responsible for the truck is generally working; one sent to a hotel and relieved is not.
Mileage and percentage pay plans miss that distinction. Decide now on a delay rate after a threshold, a flat chain-up payment, and a layover rate that matches what you bill. For owner-operators, make weather layover pass-through explicit in the contract.
Making the winter policy run itself
Every operation's lanes, customers, equipment and pay plans differ, which is why a generic winter memo rarely survives the first storm. Shops that handle winter well encode their own policy in the system they dispatch from. A weather-hold load status that pauses service-failure scoring. Rules that require chain confirmation on BC tenders from October 1 to April 30 and flag traction-device authorizations near expiry. Permissions that limit who can waive a TONU or approve layover. Billing rules that create the accessorial when the status changes, with the road report attached. Visibility for customers that shows the closure, not just "late." That is the difference between a winter policy and a winter habit.
FAQ
When do BC winter tire and chain requirements apply to commercial trucks?
They apply from October 1 to April 30 on most designated BC highways, ending March 31 on select routes outside mountain passes and high snowfall areas. Commercial vehicles of 11,794 kg LGVW or more must carry steel chains on most major highways during that period.
Do heavy trucks need winter tires in Quebec?
No, Quebec's December 1 to March 15 winter tire requirement does not apply to heavy vehicles, trailers or vehicles registered outside Quebec. It does apply to Quebec-registered light fleet vehicles such as pickups and service vans.
Can a driver extend hours for a snowstorm under Canadian federal HOS?
Yes, but only if the condition could not reasonably have been known before the driver began driving, and only by up to 2 hours. The driver must still take 8 consecutive hours off duty and record the reason.
Is time waiting at a highway closure on-duty time?
Yes, under SOR/2005-313, waiting at an en-route point because of an accident or other unplanned occurrence counts as on-duty time unless the driver is in the sleeper berth or properly off duty.
Who pays TONU or layover when weather closes a road in Canada?
Whoever the contract says pays, because no Canadian regulation sets weather accessorials. In Ontario, the uniform conditions of carriage excuse carrier delay caused by an act of God and do not bind a carrier to a delivery time unless specifically endorsed and signed.