Frequently asked questions - grit
What is grit?
We use brown, unrefined rock salt with a gritty texture to reduce the risk of winter hazards. It is spread when forecasted conditions indicate a need to prevent ice formation.
How does it work?
Salt lowers the freezing point of water when driven or walked over, forming a solution that helps melt ice. It is most effective on busy roads with high traffic volumes. Salt becomes ineffective below -8°C, so it must be applied before ice forms.
When do you grit?
Most gritting takes place overnight. During October–April, fewer crews are available during the day for other maintenance tasks.
We receive weather forecasts three times daily and can consult with providers 24/7. Treatments are based on road surface temperatures and forecasted hazards.
Why is there snow on a road that’s been gritted?
Salt needs traffic to activate its de-icing properties. Roads with less traffic may take longer to clear.
Equipment and Salt Stock
- We operate a fleet of around 40 gritters and snowploughs, with support from specialist contractors.
- We maintain a stock of approximately 20,000 tonnes of salt, replenished throughout the season.
Disputes and Usage
- Grit bin application outcomes cannot be challenged.
- Salt is for public highway use only—not for private paths or driveways.
- One bag of sugar-sized amount of salt covers approximately 25m².
For guidance on clearing snow and ice, please refer to Gov.uk website.
