There was a bad case of the runs near Toowoomba on Wednesday morning when a truck carrying 27 tonnes of human waste lost its load after the driver was allegedly forced to brake to avoid a collision.

The Arkwood Organic Recycling truck was on Crowley Vale Road off the Warrego Highway at Crowley Vale, 45 kilometres east of Toowoomba, when the driver is believed to have swerved and applied the brakes to avoid a merging car.

A truck carrying 27 tonnes of human waste spilled its load on Wednesday morning near Toowoomba. Credit:Emily Gayton - 7 News Toowoomba

Two tonnes of the waste pulled through the load's tarpaulin cover and ended up on the road just after 8am.

Arkwood Organic Recycling co-director Elissa Clarke said "it's like carting a fish bowl" and the sudden braking had forced the waste to spill through the cover.