Icy roads have caused widespread disruption to traffic in northern Lincolnshire.
The westbound carriageway of the A180 out of Grimsby was closed for several hours after two pile-ups.
The A18 Mortal Ash Hill near the steelworks in Scunthorpe was also badly affected as ice caused several vehicles to collide.
A Met Office severe weather alert said icy conditions would remain in the region until at least Christmas Day.
Temperatures dropped to about -8C in north Lincolnshire overnight and were expected to hit -5C on Tuesday night, the Met Office said.
In East Yorkshire, the sub-zero temperatures caused level crossing barriers in Beverley's Station Square, to freeze in the down position causing traffic snarl-ups for the second successive day on Tuesday.
Technicians were called out to fix the barriers and traffic was later flowing freely, Humberside Police said.