How to Avoid Being Pranked by Spring on the Coquihalla

Warning! Don’t let spring play an April Fools’ prank on you.

Roadside signs state passenger vehicles are required to have winter tires, and commercial trucks must carry chains, on most BC highways between October 1 and March 31 (or to April 30, depending on the highway). However, that doesn’t mean winter tires and chains are never needed beyond those dates.

Sometimes spring lets Old Man Winter outstay his welcome, especially on high elevation routes such as the Coquihalla. Professional truck drivers who travel BC’s high mountain passes typically carry chains year-round, and we really appreciate that. By being prepared for the unexpected, these pro drivers contribute to the safety and reliability of our highways.

It’s always best to check DriveBC before you head out. If a late season snow storm strikes, you may want to consider delaying your trip or taking a lower elevation route, if you have already taken your winter tires off or left the chains back at the shop.

… which leads us to the topic of chain-up enforcement on the Coquihalla.

It is so important that commercial vehicles follow chain-up requirements. This is particularly true for the Coquihalla, the province’s busiest mountain pass. We’ve received questions from you about how chain-up regulations are enforced, and what factors are involved in us determining when a mandatory chain-up is needed.

We’ll explain here.


All it takes is a single spun-out commercial truck to block the highway, possibly leading to incidents and delays to all those using the highway. That’s why our Commercial Vehicle Safety and Enforcement (CVSE) officers spend a lot of time enforcing chain-up requirements, especially during Coquihalla Snow Shed Protocol severe weather events (there has been more than 20 of these events this winter!).

During the protocol, CVSE officers mobilize in and around Snow Shed Hill, focusing on chain-up, brake checks, illegal passing of plows and speeding within the variable speed limit zone. From November 2016 through March 2017, CVSE issued 210 violation tickets along the corridor; with 1,000 commercial trucks travelling the Coquihalla every day, this suggests there is generally good compliance from the industry, yet CVSE is at the ready to hold the others into account.

Deciding When Chain-up is Needed

There are many factors we need to consider when deciding whether or not to turn on the mandatory chain up lights for commercial vehicles. Sometimes the decision is easy, other times it is not. If an unchained commercial truck spins out on the hill…easy… it’s a good indication chain-up is required.

But fluctuating weather conditions can make for a tough call.

We often experience transitions from rain to heavy, wet snow along Snow Shed Hill. Although the road may be bare, it often changes to snow at some point before reaching the summit. The heavy snow may not appear significant, but it leads to challenging traction for commercial trucks.

During the Coquihalla Snow Shed Protocol, our maintenance contractor VSA Maintenance is in regular communication with weather forecasters. Activating and deactivating chain-up signs depend on both current and forecasted weather.

Sometimes, we hear from commercial truck drivers who question the need for a chain-up. Although some trucks may not have a problem, others might – there is significant variation in trailer loading, the amount of weight over the drive axles, and the available traction of any given commercial vehicle.

Highway safety is no joke. We choose to take a conservative approach to ensure the safety and reliability of the corridor.

Our listing of current chain-up requirements is a helpful webpage to bookmark. Check it before setting out to cut down on any surprises spring may throw at you.


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Page 1 of 14 comments on “How to Avoid Being Pranked by Spring on the Coquihalla”

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  1. Hi in winter sometimes commercial truck stops when going up after snow shed even if chains are on than towing truck charge $$ to pull, i heard they cant charge $$ to truck because bc trans pay them to for pulling trucks so whats the reality??

    • Hi JD,

      We aren’t sure we understand your question completely. Are you asking if tow truck operators are employed by the ministry to tow non- compliant commercial vehicles?

          • Hi there,

            Yes, our maintenance contractors hire tow trucks to manage a defined area on the snowshed hill area during specific circumstances. The maintenance contractor pays the operators to stand by and the tow truck operators will charge the truck driver for the rescue. Make sense?

    • Hi Max,

      Sweeping operations are under way at lower elevations currently. Centreline and fog line sweeping is being done prior to line painting which will occur before May Long Weekend.

      Shoulder deposits get addressed over the summer.

      All operations are reactive to spring weather and last snowfalls.

  2. It would be interesting to know what the variable speed signs were set at during yesterdays multiple accidents and sad fatality. Were they giving adequate warning of the reportedly abrupt change in driving conditions?

    If the variable speed limit signs were giving appropriate warning it would seem that too many drivers were ignoring them.

    • Hello Nick,

      We looked into this and can confirm the system was functioning normally and speeds were lowered throughout the corridor by the system recommended speeds, ranging from 60 to 90 km/hr during the same time frame as the incident.

      • Thinking about it again, I don’t think the collisions were in the variable speed zone.

        Would still be very interested in knowing what the actual traffic speeds have been this winter when the variable speed limit has been reduced. It is going to take at least another winter to get any idea whether they have reduced the number or severity of accidents.

          • hrm I was on the Coq a few weeks ago, was a nasty snow event going up and down hit between Hope and Merritt on two different days. The variable speed zone signage was beloe the normal 120 of course, but was still too fast for safe travel in the level of snow that was on the ground, still falling and blowing around. Even at times the 97C could of used some slower marked zones on the Friday I was up there heading to Kelowna. Just an observation from a highly experienced and well equipped driver and vehicle.