Police are appealing to the public to avoid the A487 between Tan y Bwlch and Penrhyndeudraeth.
North Wales Police are still at the scene of a crash that took place earlier today.
A police spokesperson said: “Due to a road traffic incident by Trwyn y Garnedd, the A487 between Tan y Bwlch and Penrhyndeudraeth is currently shut.
“Please avoid the area for the time being.
“Thank you for your patience and co-operation.”