Two people were taken to Ysbyty Gwynedd in Bangor after a motorcycle and a car collided on the Felinheli bypass on Sunday afternoon.
Police and the ambulance service attended the incident which occurred just before 4pm. Police closed both lanes of the bypass for 2 hours and a diversion was put in place through Y Felinheli.
A spokeswoman for the Welsh Ambulance Service said: “We were called at 4.04pm to a report of a car and motorcycle road traffic collision on the A487.
“We responded with one rapid response vehicle and an emergency ambulance.”
A male motorcyclist and a woman were taken to Ysbyty Gwynedd
The road was reopened at 6.15pm.