And across Bedfordshire, Hertfordshire and Buckinghamshire, over 230 have been told to close by police.
They just don't think it's safe for people to be travelling in the icy conditions.
As well as the safety worries, many homes, schools and businesses have had their power cut off because of the weather.
Jams
And on Thursday night, thousands faced hours of chaos as they tried to get anywhere in cars.
Hundreds spent the night in their cars after traffic jams and icy roads made it impossible to move.
Many had to abandon them in the roads.
Forecasters say there will be freezing weather again on Friday night, with ice on the roads causing more dangerous conditions.
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