Highways England said traffic was held up between junctions 2 and 1 on the westbound A14 because of a stray hot tub cover.
The hot tub lid blew on to the lane this morning and traffic had to be stopped.
Highways England said: "Traffic Officers would like to thank the kind motorists that assisted us to remove it and getting everyone moving again."
Junctions 1 and 2 are between Welford and Kelmarsh in Northamptonshire.