Traffic is building up on the M55 after a wheelbarrow fell off a flatbed truck and hit the central reservation, police said.
Two lanes were closed after the collision, which is said to have happened westbound, close to junction three for Kirkham, shortly after 8am.
It came amid heavy rain, with one motorist tweeting: “I can categorically tell you it’s horsing it out of the sky just now.
“The M6 and M55 are rivers.”
All lanes are now reopen.