There are severe delays on the A1 northbound near Wetherby following a serious accident this morning.
Emergency services were called to the scene a mile south of junction 46, at about 7am, following a report that a lorry had left the carriageway and come to rest in a ditch
The male driver of the lorry has suffered serious leg injuries.
Two northbound carriageways are closed while the scene is cleared.
Traffic is being diverted and the Highways Agency said road users should follow the square diversion symbol between junctions 45 and 46.