The Highways Agency is launching a campaign to remind the region's drivers to prepare their vehicles for the winter weather.
The organisation's latest research shows that one in three drivers using the M25 do not check their vehicles or carry de-icer with them when they travel in severe weather.
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Monday evening's weather with Manali Lukha
New analysis identified five areas where more than one in five people smoke.
Warm and largely dry initially, some rain later this week.