Roads made impassable by the snow forced many drivers in Scotland to spend the night in their cars.
Motorists on the M80 near Glasgow were stuck for up to 13 hours, with some remaining in their vehicles overnight or abandoning them on the motorway.
Police Scotland warned people to avoid travelling at all costs on Thursday as a red weather warning remained in place across the country until 10am.
The force tweeted: "Todays advice: don't travel unless you're an emergency worker. #REDALERT remains till 10am and at best will reduce to Yellow."
Scotland's Transport Minister Humza Yousaf also urged people not to travel "unless it is absolutely necessary".
Two separate South Western Railway trains broke down - and passengers were left with no water, food or heating for more than 12 hours.
A red "danger to life" weather warning has been issued in the south west and Wales as the region braces for up to 50cm of snow.
A man has died after being pulled from a lake in south east London.