The A30 at Haselbury Plucknett is closed in both directions due to ice between the A3066 North Street and Chinnock Hollow.
More top news
Mist and fog patches from overnight will clear by mid-morning and it will be a dry day with sunny spells for most.
Any mist patches that developed overnight will clear by mid-day, leaving a dry and mostly sunny day for the region.
MP Johnny Mercer, who was only elected in 2015, said he would not have run in Plymouth Moor View "if the situation was like it is now".