Police have appealed for drivers to take extra care after five people died in a weekend of tragedy on Norfolk’s roads.
Three people were killed in a crash between a BMW and a Vauxhall SUV between Middleton and King's Lynn on Sunday evening.
In the early hours of the same day, the 35-year-old driver of an Audi S4 died when he collided with a tree at the A47 roundabout at Wisbech.
Meanwhile, a man in his 40s died after he was involved in a two-vehicle crash on the A1075 near Shipdham on Friday night.
And a woman in her 90s remains in a critical condition in hospital, after being hit by a bus in Norwich city centre on Saturday morning.
Police said early investigations suggest there is no common cause between the incidents, but urged drivers to take care as a cold spell could see minus temperatures.
Inspector Simon Jones, of Norfolk and Suffolk Roads Policing Unit, said: "Firstly, our thoughts are with the family and friends of those who have been affected by these incidents.
“We are carrying out thorough investigations for all four collisions so it would not be appropriate to comment further on those specifically.
“However, we would like to ask people to take extra care as the road conditions worsen and allow plenty of time for their journeys.”
The five tragedies mean, just two weeks into the new year, road fatalities have already reached a fifth the total seen on the county’s roads in the whole of 2021, when 19 people died, the lowest number for a decade.
The A47 was closed for more than 12 hours after emergency services were called to the collision between a white Vauxhall Mokka and black BMW X5 about a quarter of a mile from the Hardwick Roundabout at 7.40pm on Sunday.
Forensic accident scene investigators worked overnight after three occupants of the Vauxhall Mokka, two aged in their 40s and one in their 20s, were pronounced dead by paramedics at the scene of the accident.
A man in his 30s was arrested on suspicion of death by dangerous driving in connection with the crash, on a single carriageway section of the road at North Runcton.
He was taken to King’s Lynn Police Investigation Centre for questioning while officers appealed for witnesses who may have seen the manner of driving of either vehicle before the crash to contact them.
Emergency services had earlier been called to the A47 roundabout in Wisbech – where the A47 meets Elm High Road - at 12.50am on Sunday.
The Audi S4 car had been travelling along Elm High Road towards the roundabout and the junction with the A47 when it left the carriageway and hit a tree. The driver, a 35-year-old man, died at the scene.
Police are seeking dash-cam as investigations continue into the cause of the crash.
Meanwhile the driver of a grey Ford Focus died following a collision with a black Kia Rio on the A1075 Dereham Road at around 8.30pm on Friday night.
One person from the Kia was taken to hospital with serious but not life-threatening injuries. Three other people sustained minor injuries in the crash.
Road deaths - can you help?
A47 North Runcton: Police are appealing for anyone who witnessed the manner of driving of either vehicle, or who witnessed the crash, to call 101 quoting reference 36/3637/23 or email the Serious Collision Investigation Unit at SCIU@Norfolk.police.uk.
A47 Wisbech: Anyone who saw the Audi hit the tree, the manner of driving or has dash cam footage to email SCIU@norfolk.police.uk or call 101 quoting incident number 9 of 15 January 2023.
A1075 Shipdham: If you have any information about the crash on Dereham Road email SCIU@norfolk.police.uk or call 101 quoting reference 438 of 13 January 2023.
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