The hours relief most dispatchers assume is available turns on whether the conditions were knowable before the driver set off — which a broadcast closure almost always was.
Key takeaways
Re-plan on the assumption that the hours relief you are counting on does not exist. The adverse driving conditions extension in the federal hours of service rules turns on whether the conditions were known or reasonably knowable before the driver set off — and a closure that has been broadcast for six hours is neither unknown nor unforeseeable. Once you accept that, winter dispatching becomes an equipment, contract and sequencing problem rather than a rules problem, and all three have answers.
The definition is the whole point. The Regulations define adverse driving conditions as snow, sleet, fog or other adverse weather or road conditions that were not known to a driver or a motor carrier dispatching a driver immediately before the driver began driving, or could not reasonably have been known to them. The carrier’s own knowledge is written into the test. If your dispatcher saw the forecast and sent the truck anyway, the exception is not available.
Where it does apply, the relief is modest and conditional. South of latitude 60°N a driver may extend the permitted 13 hours of driving time and reduce the 2 hours of daily off-duty time by the amount needed to complete the trip, provided driving, on-duty and elapsed time in the cycle are not extended by more than 2 hours, the required 8 consecutive hours off duty is still taken, and the trip could have been completed under normal conditions without the reduction. North of 60°N the 15-hour driving time may be extended by up to 2 hours on the same conditions. And whichever applies, the driver must record the reason for the extension in the record of duty status. British Columbia mirrors the provision in its own regulation at section 37.17 of Division 37.
The emergency exemption is separate and much narrower: the requirements do not apply to a driver who, in an emergency, requires more driving time to reach a destination that provides safety for the occupants of the vehicle and other road users, or the security of the vehicle and its load. That is about reaching safety. It is not about reaching the receiver.
A re-route that a Toronto dispatcher can draw on a map may be closed to the equipment on the truck. In British Columbia, drivers must obey winter tire and chain signs throughout the province from October 1 to April 30, with requirements ending March 31 on select highways not through mountain passes or high-snowfall areas, and going beyond the signs without the equipment can mean being turned around by the RCMP or Commercial Vehicle Safety and Enforcement, and fined.
The specifications are exact. A winter tire in British Columbia must have at least 3.5 mm of tread depth and be labelled on a sidewall with either the three-peaked mountain and snowflake symbol or the letters “M” and “S”. Chain requirements scale with configuration: for a commercial vehicle at or above 11,794 kg licensed gross vehicle weight and not towing a trailer, steel chains must be fastened on at least one tire on each side of one drive axle; towing one trailer, at least two tires on each side of a single drive axle, or the specified combination across a tandem or tridem; and towing more than one trailer, two tires on each side of one drive axle and one on each side of another axle of the tandem or tridem. Substituting a traction device on those heavy configurations is only permitted where the minister has authorised it in writing for the carrier, the authorisation is in the driver’s possession, and its terms — which may include driver training requirements, named highways and an expiry no more than one year out — are complied with.
Ontario’s constraint is different in kind. Studded tires are allowed on vehicles registered in Northern Ontario and are not allowed in Southern Ontario unless the driver is visiting from out of province or is a Northern Ontario resident. And the province’s own advice for planning is to check the forecast, delay the trip if conditions look bad, and use Ontario 511 to check road conditions and plough locations — which is also the evidence that the conditions were knowable.
Carriers negotiating a missed appointment in a snowstorm often argue from goodwill when they could be arguing from the conditions of carriage. Which conditions apply is settled by the Conditions of Carriage Regulations, under which the conditions and limitations of liability for extra-provincial trucking are those of the province in which the transport originates.
Taking British Columbia as the worked case, the Specified Conditions provide that the carrier is not bound to transport the goods by any particular vehicle, or in time for any particular market, or otherwise than with due dispatch, unless by agreement specifically endorsed on the bill of lading and signed by the parties. They also exclude liability for loss, damage or delay because of an act of God, riots, strikes or a defect or inherent vice in the goods. And in a case of physical necessity, the carrier may forward the goods by any conveyance or route between the point of shipment and the destination, with liability unchanged as though the entire carriage were by highway. That last one is the express authority for a re-route.
Where the load cannot be delivered at all, there is a procedure rather than an improvisation: after notifying consignor and consignee that delivery has not been made and requesting disposal instructions, the carrier may store the goods in its own warehouse for a reasonable charge, or move them to a public or licensed warehouse at the consignor’s expense, subject to a lien for freight and other lawful charges, and if no disposal instructions arrive within 10 days of that notice, the carrier may return the undelivered shipment to the consignor at the consignor’s expense. Note that a weather delay does not stop the claim clock: notice of loss, damage or delay must still be given within 60 days after delivery, or within 9 months of the shipment date where delivery fails.
When a corridor closes, the useful question is not “how do we get this load through”. It is “which of the next four days’ commitments am I about to lose”. A driver held at a closure is accruing on-duty time under the same 70-hour-in-7-days or 120-hour-in-14-days cycle as everything else, and the cost of the closure usually lands two days later on a different customer.
Three things are worth deciding before the closure, in a written policy: whether drivers stop early on a forecast rather than pushing to the pass, who is authorised to spend money on accommodation without calling the owner, and which customers get the first phone call. Fleets that decide these in the moment decide them badly.
Worked example: a Coquihalla closure on a Tuesday afternoon
An Alberta carrier has two trucks Vancouver-bound on Highway 5 and one loading in Kamloops. A closure is announced with no estimated reopening.
The first instinct is to ask both drivers to hold near the closure and run when it opens. The dispatcher tests that against the rules and drops it. Both drivers began the day knowing the forecast, so the adverse driving conditions extension is not available to them: the definition requires conditions that were not known, and could not reasonably have been known, to the driver or the dispatching carrier before driving began. Waiting at the closure is also on-duty time, so holding four hours costs four hours of tomorrow.
The plan becomes: both en-route drivers take their 8 consecutive hours now, at the last safe stop with facilities, rather than burning the window waiting. The Kamloops load is not started. The Vancouver receiver is called before the closure is in the news, and the conversation is framed on the contract — the carrier is not bound to deliver in time for any particular market absent a specific signed endorsement — rather than on apology.
One driver is short of chains for a tandem drive configuration and would not have been legal past the signs in any event. That is found on Tuesday afternoon, in the yard file, and not at a check point.
Only if the conditions were genuinely unknown and could not reasonably have been known before driving began, and even then the extension is capped at 2 hours, requires the 8 consecutive hours off to still be taken, and must be recorded with its reason in the record of duty status. A publicly announced closure will rarely meet that test.
It depends on the originating province’s conditions and on what your contract says. Where British Columbia’s Specified Conditions apply, the carrier is not bound to deliver in time for any particular market unless that is specifically endorsed on the bill of lading and signed. If your customer contract contains a delivery guarantee, that is a legal question worth settling before winter, not during it.
In British Columbia the sign governs, and the regulation defines what “equipped with chains” means for each configuration — for a heavy commercial vehicle towing one trailer, at least two tires on each side of a single drive axle, for example. Carrying chains you cannot lawfully substitute a traction device for is not compliance.
Matching each truck’s equipment file against the seasonal requirements of every route it might be re-planned onto, and surfacing the mismatch before the truck leaves. That is a comparison task, not a decision. A person decides whether to run, hold or reroute — see assignment rules and scheduling around terminal windows.
Three decisions written down in advance — stop early, spend authority, call order — change how a bad week ends.
