A vehicle ended up in a ditch leading police to close the road between the Queniborough roundabout and the Rearsby Bypass.
The driver was treated at the scene by a crew from East Midlands Ambulance Service.
A spokeswoman for Leicestershire Police said: “We were called to a single vehicle collision just before 5.50pm on Monday.
“It’s believed the driver was unwell at the wheel and his vehicle left the road and came to rest in a ditch.
“Local road closures were in place and were lifted around 9.20pm.”