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Winter Operations FAQ | Mainroad Fraser Maintenance LP

During winter operations, Mainroad experiences a high frequency of questions from the public – this resource aims to answer most frequently asked questions and provide other helpful resources.

What is the road/highway service area that Mainroad Fraser Maintenance is responsible for maintaining?

Mainroad is responsible for the plowing and maintenance of the South Fraser Perimeter Road (SFPR).  The SFPR is a four-lane, 80 km/hr route along the south side of the Fraser River, extending from Deltaport Way in Southwest Delta to 176th Street.  The Service Area is 166 lane kilometers and includes 100 structures (e.g. bridges, retaining walls, culverts, and sign structures).

*Please Note: Mainroad is not responsible for plowing within municipal boundaries and any snowplow discharge falling on residential driveways is the responsibility of the property owner.
TranBC Link: 4 Reasons Why Piling Your “Private Snow” on Roads is a “No”

Where are Mainroad's maintenance yards located?

Mainroad’s headquarters and primary works yard for Mainroad Fraser Maintenance is based in Langley (Port Kells).

How many Mainroad employees are working during winter operations?

Our fleet and crews are fully engaged in winter maintenance operations.  Up to 12 employees plus mechanical support are available to work around the clock to keep our roads clear.

How does Mainroad monitor weather and highways conditions?

Lower Mainland winter weather can be unpredictable when we tend to experience
micro-climates in some parts of the SFPR. For example:

  • Areas near the Fraser River between Hwy 91 Connector and Port Mann Bridge
  • Delta/Ladner

Mainroad is constantly monitoring weather and highway conditions. To determine how best to protect motorists, we oversee weather in two ways:

1. Monitoring:

Road Patrols: Prior to and during a storm event, our operators are on the road observing current conditions and making the calls as to what maintenance is required.

2. Forecasting:

Mainroad uses data derived from Road Weather Information System (RWIS) stations throughout our maintenance areas for weather forecasting.

Road Weather Forecasting: Environment Canada’s Meteorological Service of Canada does not perform road weather forecasting.  This vital service is only available through private sector service providers.  Mainroad Lower Mainland Contracting contracts with a leading road weather forecaster, which watches over B.C. weather 24 hours a day, seven days a week.

TranBC Link | More on how the BC Ministry of Transportation & Infrastructure monitors weather and highway conditions

Environment Canada also contributes to our weather watch, providing regional forecasts.  Combined with additional weather information from other sources, these tools help us predict road conditions.  But firsthand experience is also a big part of knowing our roads.  That is why Mainroad patrols the highways on a regular basis.

What is Mainroad doing to prepare for a winter storm event?

Mainroad crews will be patrolling service area highways and roads while monitoring the forecast closely. Crews will apply specific material to the road surface as determined by the forecast and actual weather conditions. Pre-storm activities typically include pre-salting/brining and monitoring the forecast closely. The proactive use of an anti-icing liquid is a proven way of combatting ice from forming on the highway surface. This technique is used throughout most highway maintenance jurisdictions in North America. During a heavy rain advisory, crews will check and clear service area catch basins.

Pre-storm activities include pre-salting and monitoring the forecast closely.

Ahead of a weather event, Mainroad releases regular road and weather updates to a contact list of local agencies, various stakeholders including the Ministry and Media to help inform the public. This helps everyone understand the current conditions, expected weather and Mainroad’s response. These updates are also posted on our social media.

When a weather event occurs, (snow, freezing rain, flooding, etc.) Mainroad crews are working around the clock plowing, sanding and/or salting as conditions warrant and we are patrolling the service area.

Up to 12 employees plus mechanical support are available to work around the clock and additional crews will be called into to plow the roads.

What materials does Mainroad use for winter road maintenance and when are these materials applied?

Mainroad primarily uses two materials in the Lower Mainland for winter road maintenance: anti-icing brine and de-icing salt with winter sand as required.  The use of a specific material is determined by the forecast, actual weather conditions and in accordance with the standard set by the Ministry.

Anti-icing Liquids (brine): Anti-icing liquids are used as a preventative material prior to snowfall.  Typically, these materials are applied prior to a forecasted winter event and dry on the highway surface to provide early on snow melting capabilities.  Brine can also act as a de-icing agent during a storm or once a storm has passed and can help to remove packed snow and ice from the road surface.  After snow has been cleared, liquid anti-icing brine is an important component in Mainroad’s plan to prevent ice from forming as it breaks down the bonding ability of ice on the road surface.

Learn more about Mainroad’s liquid anti-icing program

Salt: Salt is a staple of our winter maintenance routine.  Sometimes salt is used in a liquid (salt brine), sometimes in a solid.  Salt melts the ice and dissolves the snow into slush or water but if the snow keeps coming, it will dilute the salt and make it less effective.  Salt is only effective in certain temperatures. If temperatures fall below -5C, salt becomes less effective.  ​

Winter Sand: The winter sand used by Mainroad is a graded material specified by the Ministry of Transportation and Infrastructure. Winter abrasives improve traction. During a snow event, restoring traction will be completed by either applying winter abrasives on compact sections or by applying winter chemicals to compact sections to melt snow and ice when pavement temperatures are above -9C.

The use of a specific material is determined by forecast and actual weather conditions.

What is Mainroad doing to respond to changing conditions during a storm event?

Weather can change rapidly in the Lower Mainland during winter which is why Mainroad is constantly monitoring weather and highway conditions. During a storm event, Mainroad crews will be working to clear the highway surfaces as quickly as possible. When temperatures permit, we will commence anti-icing operations with the goal of getting the compact snow off service area highways and roads. On primary routes, we will aim to have bare and black conditions from the completion of the weather event as quickly as possible however challenging weather will not always permit us to have bare and black conditions on secondary routes. During every storm event, Mainroad will provide the Ministry and Media with regular updates.

Other Types of Winter Storm Response

Clearing down trees and vegetation after other types of winter storms such as a windstorm can take some time for our crews to respond particularly if they encounter a down power line. In this case, crews will coordinate with BC Hydro to determine when the area is safe. If you see a tree within three (3) metres of a power line, leave the tree alone and call BC Hydro at 1-800-224-9376. Avoid touching anything, such as a car, object or equipment, or anyone who is in contact with a fallen power line. Keep children and pets away from fallen electric lines. Avoid driving over a fallen power line. Call 911 immediately to report a fallen power line.

Driveway Culvert Maintenance Responsibilities on BC Highways: Your Questions Answered

TranBC Link: Do you own property along a BC highway? If you do, you may have some questions about driveway culverts and culvert maintenance

What is Mainroad's plowing process and how does it affect the travelling public?

When plowing, Mainroad’s operators always move the snow from the far left lane to the right shoulder and on routes that include signalized intersections the left lane could be the left turn slot.

TranBC Link | A look behind the scenes at winter maintenance in B.C.

Rural Property Owners Responsibilities

Do you need to make an emergency stop on BC Hwy 17?

Here’s some helpful information (weather permitting of course)

Highway 17 (SFPR) Suggested Emergency Stop Locations  – Westbound Direction
W/B #1: Wide shoulder, approximately 400 m west of Port Mann Bridge
W/B #2: Wide shoulder, approximately 1.2 km west of Tannery Road Underpass
W/B #3: Wide shoulder at Elevator Road
W/B #4: Truck stopping area on shoulder, approximately 850 m west of Highway 91 Connector Interchange

Highway 17 (SFPR) Suggested Emergency Stop Locations – Eastbound Direction
E/B #1: Wide shoulder at 36th Ave Overpass
E/B #2: Wide shoulder, approximately 450 m east of Highway 99 off ramp
E/B #3: Wide shoulder, approximately 1.5 km east of Highway 99 Interchange
E/B #4: Truck stopping area on shoulder, approximately 1.8 km west of Highway 91 Connector Interchange
E/B #5: Wide shoulder, approximately 1.5 km west of Tannery Road Underpass

Who ensures the work is being done properly?

There are two ways in which work is assessed against contractual commitments:
Mainroad has a vigorous quality assurance program in place, which tracks our own performance. Should areas of concern be detected, measures are put in place to deal with the shortcoming and processes are modified to prevent recurrence. Mainroad is an ISO compliant company and its quality programs are built on those models.

The Ministry of Transportation and Infrastructure has an ongoing inspection process that involves a high-level overview using resources from areas across the Province, as well as numerous detailed inspections that drill into the inside workings of Mainroad’s maintenance practices. Mainroad has a very good performance rating, as measured against our contractual commitments.

Where can I direct concerns about road conditions to Mainroad Fraser Maintenance?

Mainroad Slow Down Driving in Winter

We appreciate public feedback!  If you come across a highway situation on the SFPR that requires maintenance response, changing road conditions, or debris, please call 604-271-0337 to report the condition and location.  Be as descriptive as possible.

Mainroad’s Call Centre is available 24 hours a day, 7 days a week – an operator will record all public feedback and forward the information to crews on shift to respond, as well as dispatch additional personnel, and update DriveBC.

You can also write Mainroad Email:

Where can I find news about Mainroad?

Please visit our recent news page

Here’s what you can do to stay safe during winter driving conditions:

Visit DriveBC |

  • For current road conditions
  • For weather forecasts
  • For real-time conditions via webcams

Fall and winter weather can be unpredictable and when we tend to experience all types of driving conditions in the Lower Mainland; heavy rain, fog, icy conditions and snow.

Give your vehicle a winter check-up and equip your family with a winter survival kit so you’re not caught off guard when weather conditions deteriorate.

We encourage drivers to choose the best winter tires possible when driving in snow and ice, and to ensure tires are in good condition, with a minimum tread depth of 3.5 mm.

Carry an emergency survival kit with non-perishable food, blankets and first aid supplies, windshield scraper and snow brush, extra windshield washer fluid, fuel line antifreeze, flares and matches or lighter, tire chains and gloves, shovel and traction mat, sand or kitty litter, flashlight and extra batteries, battery jumper cables, spare tire wheel wrench and jack, extra clothing and footwear and sandbags for extra weight.

Driving during winter driving conditions

  • Conditions change and so should your speed.  Please SLOW DOWN and drive for the conditions.
  • We encourage all motorists to drive to the conditions during the winter season, slow down, and increase the distance between yourself and the vehicle in front of you.

TranBC Link: How to drive around snow plows in British Columbia

Snow Plow Safety Do’s and Don’ts

Do……Turn on your head and taillights during heavy snow or rain, even during the day.

Do……Use winter-rated snow tires with the mountain-snowflake symbol.

Do……Watch for the flashing amber lights.  It can be difficult to see snow removal equipment.

Do……Give snow plows plenty of space – about 10 car lengths.  Salt and winter abrasives, as well as rocks and other debris in the snow, can fly – hitting nearby vehicles and decreasing visibility.

Do……Remember the road surface ahead of the plow hasn’t been plowed yet therefore please slow down and be patient.  The operator will eventually pull over when it is safe to do so to allow motorists to pass, so take your time, wait and be safe. 

Do……Pull as far over to the right as is safe when you see a snow plow approaching from the opposite direction along an undivided highway. That way, you will be clear of any salt or winter abrasives.

Do……Give the snow plow operator a wave when they pull over to let you pass. They’re doing the job for you!

Don’t……Assume the snow plow operator can see you, especially if you’re driving too close and visibility is poor (which it often is in snowstorms). Your best defense is to keep your distance.


…Pass snow plows. It’s not safe. When drivers attempt to pass a plow truck, they put themselves, their passengers, the snow plow operator and other motorists at risk. The plow could be equipped with a wing blade on its left or right side, which can be obstructed by the snow it’s throwing. The plow also may be the first of a series of two to four more plows, staggered diagonally across the road to clear all lanes simultaneously. This practice is called Echelon Plowing and would require the unwise driver to make multiple unsafe passes. 

Don’t……Tailgate.  Tailgating any vehicle puts you at risk of a collision; tailgating a piece of heavy equipment armed with plows only ups the consequences.

Drivers may not be aware…Snow plows must travel slower than regular traffic when pushing snow and spreading salt and winter abrasives.

Snow plows stop at railway crossings to ensure it is safe to cross and that the plow blade will clear the track.

Shift into Winter and TranBC Winter Driving Online Resources

Mainroad is a Winter Driving Safety Alliance partner.  We actively promote  Shift into Winter, a public awareness campaign designed to inform B.C.  drivers about the importance of safe winter driving.  We encourage everyone to visit for resources and tips on how to stay safe on the road this winter.

Shift into Winter
Shift into Winter
Shift into Winter


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