Winter Road Safety on the Billy-Diamond Highway

The SDBJ wishes to inform road users that in extreme cold, de-icing practices change. Indeed, the salt used to melt ice loses effectiveness at very low temperatures. Experts note that beyond approximately −12 °C, “all salting becomes ineffective.” In practical terms, when temperatures are very cold (for example, around −15 °C or lower), salt can no longer prevent ice formation, and the roadway often remains partially icy despite spreading operations.

Enhanced sanding and its limits

To compensate, the SDBJ increases the application of sand (or other abrasives) on the RBD to mechanically improve tire traction. Sand does not melt ice but creates a “gripping layer” between tires and snow or ice, which helps reduce skidding. However, this method has significant limitations:

• Sand is light and non-adhesive. In strong winds or under heavy traffic, the sand that has been spread can be quickly blown or dispersed off the roadway.
• As a result, even after sanding, traction improvements may be temporary, as some of the sand can be blown away or displaced by passing trucks, reducing its effectiveness.

Tips for safe driving

In these challenging winter conditions, every road user must adapt their driving. Key recommendations include:

• Adjust your speed: Slow down and adapt your speed to conditions (ice, snow, reduced visibility). Road authorities recommend “adjusting your speed to road and weather conditions.” In short, drive slower than usual when roads are icy.
• Maintain safe following distances: Increase the gap between your vehicle and the one ahead. Sand or gravel particles thrown by fast-moving vehicles can damage your windshield. Your best protection is to “slow down and keep your distance” to avoid flying debris or sudden swerves.
• Avoid risky passing: Do not pass trucks that are spreading sand on the roadway. Snow removal vehicles often project gravel and sand behind them. It is recommended to “not pass trucks applying winter abrasives.” Stay behind them until it is safe to pass, which helps protect your vehicle from abrasive projections.
• Pay attention to snow removal operations: Follow signage and instructions from field crews. In very slippery conditions, certain sections may be temporarily closed for intensive sanding operations.
• Check SDBJ updates: The SDBJ conducts daily patrols of the road network and updates traffic conditions every day (Road Conditions page on the website). Stay informed by consulting official bulletins regularly.

By following these simple recommendations, you contribute to everyone’s safety. During periods of extreme cold, remember that only cautious behavior can offset the limits of road treatments. Adapt your driving to conditions (reduced traction, freezing fog, projected sand) and remain highly vigilant. Even if the roadway remains partially icy despite our interventions, you will be able to travel safely.