A lorry driver was taken to hospital with serious injuries after his vehicle overturned and shed its load of concrete.
The accident happened at around 8.45am on Newall Carr Road in Otley.
The road, between The Grills and Moor Lane, has been closed for safety reasons while the carriageway is cleared.
The driver is thought to have suffered chest injuries and was taken to Leeds General Infirmary.
The air ambulance attended.