The first alarm came at half past seven when a car had overturned on the E18 outside Bålsta near Ekolsund in the direction of Enköping.
The driver was taken to hospital by ambulance.
- The road was completely closed for a short time, says Henrik Jynnesjö, management operator at the rescue center Mitt.
A quarter of an hour later, another car overturned in the same direction at the Frösvit tunnel in Enköping.
- There does not seem to be any injuries, says Henrik Jynnesjö.
A lane must have been closed for less than an hour.