Don't know about you, but I've seen so many people driving about with huge mounds of snow on top of their cars over the last few days.
The government has highlighted the problem.
Their official guide on driving in adverse weather conditions says the following:
Before you set off, you MUST be able to see, so clear all snow and ice from your windows.
You MUST ensure that lights are clean and number plates are visible.
Make sure the mirrors are clear and the windows are de-misted thoroughly.
Remove all snow that might fall off into the path of other road users.
For a full guide, visit here.