Lincolnshire Police called to crashes amid ice and snow
More than 30 road traffic collisions were reported to Lincolnshire Police in nine hours amid "treacherous" ice and snow.
A force control room inspector said there were only four incidents during similar conditions a few months ago.
Inspector Mark Hillson said some people were not driving appropriately for the conditions this time.
Incidents have included a school bus which left the road near Whaplode shortly after 08:00 GMT.
Insp Hillson said: "Conditions do appear to be quite treacherous. On my way to work I saw a car in a ditch and a car parked in a bush."
'Quite a lot'
He said there were more than 30 reported incidents in the nine hours from midnight and most would have been caused by the snow and ice.
The true number of accidents was likely to be higher, he said, because many would not have been reported to police.
"Thirty-odd incidents is quite a lot," said Insp Hillson.
"People were avoiding unnecessary journeys when it snowed before and were driving more carefully."
Parts of the A151, A1 and A15 were closed because of incidents, including an articulated lorry that jack-knifed on the A1 at Colsterworth.
Insp Hillson said none of the collisions had resulted in major injuries.
He advised people to avoid unnecessary journeys and to drive carefully if they do need to travel, allowing extra time for journeys.