The drive up north turned into a long ordeal for many travellers following an accident after the Menora Tunnel near Jelapang.
In the 11.45am incident, a trailer and a car collided, causing both vehicles to go up in flames, blocking traffic at the 255.6km mark.
At 4pm, more than four hours later, the Fire and Rescue Department was still trying to put out the fire, and traffic flow was slow.
The trailer, transporting iron ore, was headed for Penang from Johor Baru.
PLUS workers were seen removing the iron ore from the trailer using an excavator.
The Fire Department said it believed there were two victims in the car.