The A14 in Northamptonshire is closed westbound between junctions 3 and 2 after a three-vehicle crash.
The air ambulance is on scene, and fire crews are working to free a trapped motorist.
Police have advised one lane will open once the air ambulance has lifted off.
Here's a full list of the roads affected by the wet and windy weather - with up to an inch of rain expected to fall today.
Dozens of roads are closed across the Midlands this morning due to flooding, including a number of main A routes.
Train and coach operators have advised passengers to check before they travel today, with limited services running for New Year's day.