A collision and fire involving two tractor-trailers is causing major traffic problems on Highway 401 just west of Highway 427.

The crash happened just after 12:20 a.m. Thursday in the westbound express lanes of Highway 401 near Renforth Drive.

Two trucks collided, causing an electrical fire in one truck's electrical system. The fire ignited one truck's load of boxes.

Toronto Fire Services eventually extinguished the blaze, but the fire left a mess that police say likely won't be cleaned up until about noon.

"The truck was completely engulfed in flames and there's really not much of it left," said OPP Sgt. Dave Woodford.

He said the truck was too damaged to tow away. Instead it will be removed piece-by-piece using a front-end loader.

As of 6 a.m., only the left westbound express lane was open. The cleanup is causing delays through the area for drivers travelling in both directions.

Man dies in single-vehicle crash

A 46-year-old man is dead after a single-vehicle crash just after 1 a.m. Thursday. Police say the accident happened on Highway 427 southbound past Rexdale Boulevard when a Dodge Caravan struck a highway divider and rolled over several times, ejecting the driver, who was pronounced dead at the scene.

Police say they don't yet know what caused the accident. The man's name won't be released until relatives are notified.