Drivers in Devon and Cornwall are being warned to take "extra care" on Wednesday morning as icy conditions are expected.
Road temperatures could drop as low as -2C overnight in Devon, according to the county council.
It follows a Yellow Warning from the Met Office for ice until 10:00.
Councillor Stuart Hughes, Cabinet Member for Highway Management in Devon, warned gritters could only treat "around 2,000 miles of our network".
"So we would encourage everyone to be mindful of conditions, reduce your speed and allow extra time for your journey”, he said.
The following advice has been issued by Devon County Council:
- Avoid overnight travel unless absolutely essential as roads will always be more hazardous at night with less traffic and colder temperatures
- Drive with care and according to the conditions
- Allow additional time for your journey and reduce your speed
- Never assume a road has been salted. Remember that showers or rain will wash salt off roads leaving them prone to ice, and in extreme cold even salting will not stop ice from forming