A motorcyclist and a car were in collision today at St Peter's Way roundabout, near the Carlsberg factory.
All emergency services were in attendance at 9.50am and the motorcyclist was taken to hospital with a suspected leg injury.
A spokeswoman for Northamptonshire Police said: "We were called just before 9.50am today to a report of a collision between a car and a motorcycle at St Peter's Way roundabout.
"The fire service and ambulance service were already there when police arrived.
"A motorcyclist was taken to hospital with a suspected leg injury."
The road was reopened to motorists just before 11.10am.