Emergency services struggled to reach patients after heavy snowfall caused travel chaos across the UK on Friday.
Traffic in the Birmingham area was gridlocked following around 4cm of snow in the afternoon. Many motorists abandoned their cars and looked for alternative ways to get home.
At one stage there was a 50-mile tailback on the M6 from Cheshire.
The West Midlands Ambulance Service warned that it was struggling to respond to calls because of the snow and the barely moving traffic. A spokesman said: "The roads are so gridlocked right across the area that it is affecting our ability to respond to 999 calls.
"The heavy snow is also making life very difficult for crews to get to incidents in more rural areas and on smaller side roads."
Birmingham Airport was shut due to fears over snow on the runways and only reopened at 7.45pm, officials said.
The situation in the area is so bad that the Royal British Legion club in Worcestershire offered stranded drivers accommodation overnight, according to the BBC.
A spokesman for traffic information company Trafficlink said: "Traffic lights are changing but no one is moving. All the tunnels in and out to the city are pretty much stationary.
"Technically rush hour has gone but people are still here. They are going to be here until the surface of the roads improves."
The city had been experiencing gridlock for "easily three hours", he said.
Similar scenes were seen in West Wales, where hundreds of drivers were gridlocked in heavy snow.
Up to 500 drivers were blocked in their cars along a 10-mile section of the A48 in Carmarthenshire, Dyfed Powys Police said.
Meanwhile the Met Office issued severe weather warnings for much of the east of England. The East Midlands, North East England, Yorkshire and Humber face up to 15cm of snow on higher ground, it said.
The snow is set to melt away over the weekend, which could cause more problems.
Rachel Vince, a forecaster at the MeteoGroup UK, the weather division of the Press Association, said: "The thaw will be setting in.
"Milder air is pushing up from the South West of the UK. The mild air is bring with it rain and wet and windy weather.
"We expect some little bits and pieces of snow for Scotland at the weekend, but generally there’s wet and windy weather for the UK."
A Met Office forecaster warned: "As the snow begins to melt in Wales and the Midlands, with rain at the same time, there is an increased threat of flooding."