Firefighters had to cut the roof of a car to let the driver out after it came off the road and hit a tree in the central island of the Braywick Roundabout.
Two fire crews from Maidenhead, police and the ambulance service were called to the crash scene at about 12.30pm today.
A man in his 30s was trapped in his Land Rover Freelander suffering back pain.
Firefighters from Maidenhead Blue Watch used hydraulic cutting equipment and a reciprocating saw to cut the roof of the vehicle.
The motorist, believed to have been coming from the Windsor direction, was taken to hospital. His injuries were not thought to be serious.
Crew manager Tom Woolgar explained because he was suffering back pain they were careful to make sure he came out as flat as possible.
He said: "We took the roof off to create as much space as possible.
"Because he was not critical we were able to take time and care to take him out in a controlled manner."
Police slow signs were in place and a vehicle recovery team arrived to deal with the Land Rover.
Contact PC Rob Storey from Taplow Roads Policing on 101 with any information.
Top Ten Articles
The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.