Why is my road still icy?

No guarantee can be given that roads will always be completely clear of ice or snow.

  • Around 90% of weather forecasts are accurate. This means that throughout a normal winter there could be days when ice forms on the road when it was not forecast and roads remain untreated.
  • On average precautionary salting routes take two hours to complete. As snow or rain starts to fall temperatures can drop several degree in a short period of time causing wet roads to freeze before they are salted.
  • Peak hour snowfall - Treatments are generally timed to avoid peak hour traffic. Whilst actions can be undertaken during peak periods the time to salt/plough will take longer in congested traffic. Where rain is forecast treatments may be timed to commence once the rain has stopped. This may not always be possible but heavy rain will wash salt off roads leaving them prone to re-icing.
  • Rain can wash salt off roads leaving them prone to re-icing.
  • When temperatures fall well below zero salt becomes less effective.
  • Dawn frost can occur on dry roads when early morning dew falls onto a cold road and freezes. It is impossible to forecast where and when this may happen. Roads at normally coldest at dawn at the end of long winter nights.
  • It takes time for salt to become effective after roads have been salted.