Two people were killed and another was injured after a car left the road and hit a tree.
Lincolnshire Police were called to the A15 Leasingham bypass at about 2.50am today.
Two men who were passengers in the car were pronounced dead at the scene, while the driver, a 27-year-old woman from Sleaford, was taken to Lincoln County Hospital.
Her injuries "are not thought to be life threatening" said a police spokesman.
The A15, which was closed for police investigations, has since reopened.
Separately, a 23-year-old man killed in a crash on Christmas Eve in Lincolnshire was today named by police as Christopher Edward Jones of Water Lane, North Witham, near Grantham.
A blue Peugeot and a white Fiat were involved in the crash at about 5.30pm on the Sleaford Road in Metheringham.
Mr Jones, who had been driving the Peugeot, died a short while later, but nobody else was injured.
A spokesman for Lincolnshire Police said: "These deaths bring the total number of people killed on the county's roads this year to 39, compared with 46 this time last year."
The police have appealed for witnesses to either incident to come forward.