Winter Operations FAQ | Mainroad Lower Mainland Contracting LP

During winter operations, Mainroad experiences a high frequency of questions from the public and media by phone and email.  This document aims to answer most frequently asked questions and provide other helpful resources.

Q. What is the road/highway service area that Mainroad Lower Mainland Contracting is responsible for maintaining?
A. Mainroad is responsible for the plowing and maintenance of British Columbia’s Lower Mainland provincial highways including:

  • Port Mann Bridge/Hwy1 – 1st Avenue to 264th St.;
  • Highway 91 and 91A;
  • Highway 99: between Oak Street Bridge and the US Border;
  • Highway 10: Hwy. 91 to Hwy. 10
  • Highway 13: between Highway 1 and the US Border;
  • Highway 15: between Highway 1 and the US Border;
  • Highway 17: Highway 17A to BC Ferries Causeway
  • Highway 17A: Highway 99 to Highway 17;
  • Lougheed Highway: between Highway 1 and Ruskin;
  • 8th Avenue: Highway 15 to Highway 99;
  • Main Arterial Routes at UBC;
  • Barnston Island.

The South Fraser Perimeter Road (SFPR) is maintained by Mainroad Fraser Maintenance LP.  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).

Lower Mainland Bridges/Tunnels

  • Port Mann Bridge
  • Alex Fraser Bridge
  • Pattullo Bridge / Knight Street Bridge (Translink infrastructure)
  • Oak Street
  • Pitt River Bridge
  • George Massey Tunnel

Mainroad is not responsible for plowing within municipal boundaries.

Lower Mainland Service Area 6 is 1,430 lane kilometers and includes the maintenance of 311 structures (e.g. bridges, retaining walls, culverts, and sign structures)

Q. What is the schedule for Traffic Counterflow Operations? 
A. The BC Ministry of Transportation and Infrastructure maintains the Lower Mainland Counterflow Operations – Lions Gate Bridge and George Massey Tunnel schedule.

Routes and Driving Conditions | HOV Lanes, Disaster Response Routes, Counterflow, Border Crossings, Drivers & Cyclists, Wildlife, In Case of Emergency, Seasonal Driving and much more.

Q. Where are Mainroad’s maintenance yards located?
A. Mainroad’s headquarters and primary works yard for Mainroad Lower Mainland Contracting is based in Surrey.  Other maintenance yards are located in:

  • Burnaby
  • Delta
  • Langley

Q. How many Mainroad employees are working during winter operations?
A. Our fleet and crews are fully engaged in winter maintenance operations.  Up to 100 employees plus mechanical support are available to work around the clock to keep our roads clear. 

Q. Why are some roads plowed more than others?  Which highways get plowing priority?
A. It’s important for everyone to know that Mainroad’s response time is determined by the standards set by the Ministry of Transportation and Infrastructure.  Priority is given to major highway routes such as numbered highways and school bus routes because those are the ones used by emergency services and the majority of traffic.  Other road frequency is determined by winter traffic volumes.  These frequencies are reviewed annually by the Ministry to ensure that plowing priorities reflect any changes in the road network.

When winter hits, we need to keep service area roads as clear as possible – that can be a challenge based on the high traffic volumes that our crews experience in the Lower Mainland.  Sometimes when the snow is falling fast, it can build up quickly again right after the plow passes. In those cases, it’s not uncommon to see those higher-priority routes plowed several times before we can turn our attention to other areas with lower traffic volumes.  It can be a real challenge to keep up with clearing the snow during a severe storm event but using the Ministry’s priority approach allows Mainroad to make the best use of resources to keep roads as safe and reliable as possible. 

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.

Clearing down trees and vegetation after other types of winter storms such as a wind storm 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 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.

Watch TranBC Video: Winter Maintenance on B.C. Highways

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; snow, heavy rain, fog, and icy conditions.

  • 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.

Snow Plow Safety Do's and Don'ts


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


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


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


…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.


…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. 


…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.


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


…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. 

…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. 

Winter Driving

Routes and Driving Conditions

Excessive Speed and Careless Driving

Travelling in an Avalanche Area

Designated Winter Tire & Chain-up Routes

Passenger Vehicle - Tire and Chain Requirements

Commercial Vehicle - Tire and Chain Requirements

Motorcycle - Tire and Chain Requirements

Recreational Vehicle & Trailer - Tire and Chain Requirements

Enforcement of Winter Tires & Chains Requirements

Q. What is Mainroad doing to prepare for a winter storm event?
A. 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 brine (for example) 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. 

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.) our entire fleet and crews will be fully engaged in winter maintenance operations.  Up to 140 employees plus mechanical support are available to work around the clock plowing, sanding and/or salting as conditions warrant and patrolling the service area.  Additional crews will be called into to plow the roads.

Q. What materials does Mainroad use for winter road maintenance and when are these materials applied?
A. 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 Brine: Anti-icing brine is 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.
  • 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 a lot more ineffective.  Also, if the ice melts and then the temperature suddenly dips, it can actually make things worse, because that slush and melted water is just going to freeze again.
  • Winter Sand: The winter sand used by Mainroad is a graded material specified by the Ministry of Transportation and Infrastructure.

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

Q. How does Mainroad monitor weather and highways conditions?
A. Lower Mainland winter weather can be unpredictable when we tend to experience
micro-climates in some parts of the service area.  For example:

  • Johnson Hill on the South side of the Port Mann Bridge
  • Hwy 99 around 24th Avenue
  • UBC Area – Main arterial routes
  • Hwy 1 248th to 264th where see increasing elevations and the region can experience icy conditions.

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

  1. Monitoring:
    Northwest Weather Net: Mainroad hires the services of Northwest Weather Net, one of the world’s leading weather forecast providers, to monitor the area’s weather and provide several forecasts, each specific to local sub-area’s needs.  We have the ability to talk directly with a forecaster to get the most accurate information.

    Road Patrols: 24 hours per day, 7 days per week our operators are on the road observing current conditions and making the calls as to what maintenance is required.

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

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

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

Q. Who ensures the work is being done properly?
A. 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 currently has a very good performance rating, as measured against our contractual commitments.

Q. Where can I direct concerns about road conditions to Mainroad Lower Mainland Contracting?
A. We encourage motorists, residents and cyclists to report all road condition concerns by phone to our 24-hour call centre number. 

Be as descriptive as possible.

All feedback is logged and passed onto our crews.

Please call 604-271-0337.  Please report accidents, unsafe road conditions and road kill to Mainroad’s 24-hour hotline.

Mainroad Lower Mainland Contracting and the Ministry of Transportation and Infrastructure take the safety of the travelling public very seriously. If you come across a highway situation in Service Area 6 requiring maintenance response, please call 604-271-0337 to report the condition and location.  An operator is available 24 hours a day, 7 days a week who can forward the information to maintenance operators on shift to respond.

Our crews cannot be everywhere at any place at any time – we really appreciate the public’s assistance in reporting their concerns to us.  Our 24-hour call centre personnel will record public communication, dispatch additional personnel and update DriveBC. 

You can also write Mainroad: Email:

Follow us on social media – Mainroad Lower Mainland Contracting currently maintains a Twitter account: @mainroadlm

Q. Where can I find news about Mainroad Lower Mainland Contracting?
A. Please visit

Location & Contact

mainroad hotline lower mainland
24 Hour Hotline
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General Manager:
Darren Ell
Mainroad Lower Mainland
17474 56th Ave.
Surrey, BC
V3S 1C3