UPDATE: 4.35pm. The blocks have now been cleared but drivers have been warned to expect residual delays in the area.
Two 10ft concrete blocks have fallen onto the westbound side of the road when a trailer overturned after a collision near Norton-in-Derwent this afternoon.
Police have called a forklift truck to attend the scene and remove them.
Diversions are in place through Malton to rejoin the A64 at the A169 interchange.