The A1(M) northbound has been closed in West Yorkshire within J41 for the M62 due to a "serious collision".
National Highways advises diverted motorists to join the M62 westbound, use the J32 roundabout to return eastbound and then re-join A1(M) northbound after the incident.
It also said drivers should expect delays on approach to the area, with three miles of congestion on approach at 8.45am.
Updates to follow.
