The A350 Blandford Road near Beacon Hill was blocked both ways due to a crash.
A car and motorcycle were involved in the crash.
Police say that the rider of the motorcycle was taken to hospital with serious, but not life-threatening or changing injuries.
The road has now re-opened.
Dorset Police’s spokesman said: “We received a report at 7.31am of a collision involving a car and a motorcycle on the A350 Blandford Road North in the area of Lytchett Heath.
“Officers attended, along with the ambulance service and one person has been taken to hospital. We do not have a condition update at this time.”
Vehicles were recovered and police left the scene at around 12.50pm.
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