Transport disruption can occur at any time, due to extreme weather conditions and or accidents or other causes of obstruction. The County Council works with other agencies to ensure that our roads and communication links are kept clear. The Highways Agency has responsibility for provision of assistance to motorists on the major trunk roads in the County, being the M5, A38, A35, A30 and A303
The Adverse Weather Plan (2.75MB - pdf help) gives guidance on assistance that would be given in the event that severe weather causes or exacerbates an incident that affects health and welfare of travellers on Devon's roads. The plan specifically covers both heatwave and severe cold weather including snow.
Also on devon.gov.uk