It is worth noting, especially at this time of the year when there has been a frost or it has snowed, that if you intend to make a trip in your car you can see quite clearly out of not only the windscreen but also all the other windows in the vehicle. According to the Highway Code it is a requirement that you must be able to do this and it is also mentioned in the Road Traffic Act of 1988.
If you are caught driving without clear vision due to say not having removed snow from your car windscreen then you could be fined and receive penalty points on your license that could lead to your motor insurance premiums going up which, we are sure you will agree, is something that you could do without.
It is also worth noting that your car insurance provider could refuse to pay out should you be deemed to have been responsible for a road traffic accident due to you not being able to see clearly out of all the windows in your car perhaps due to not demisting them. It may be tempting to avoid being late for work to get in your car having only partly cleared the windows of snow and ice and drive away only to drive into another vehicle ahead of you but it really is not worth taking the risk. You also need to make sure that your lights are clear of snow and ice.
Do not forget to remove all the snow that is sitting anywhere else on the vehicle such as the roof, boot and bonnet. One of the reasons for this is that if a section of snow came off the car whilst you were driving causing another vehicle to take evasive action resulting in a road traffic accident then you could be deemed to be at fault. Do remember that if you make a claim on your car insurance then this could also result in your premiums increasing.
So, allow extra time in inclement weather to make sure that your car is completely clear of snow and ice and that the windows are fully demisted otherwise you would be committing an offence and liable to prosecution thus impacting on your car insurance.