Several toilets and other falling debris from an overpass snarled traffic Tuesday morning on the 134, 170 and 101 freeways in the San Fernando Valley, but nearly all lanes had reopened a few hours later, authorities said.

The California Highway Patrol began receiving reports of the debris around 5:15 a.m. A stake bed truck carrying bathroom equipment — most of it porcelain — was traveling westbound on the 134 Freeway and transitioning to the northbound 170 Freeway when the driver lost control and traveled over freeway vegetation in the middle of the transition road, said Sgt. Saul Gomez of the CHP’s Altadena office.

The truck then collided with the overpass bridge at the 101 Freeway and 170 Freeway transition, causing debris from the bed of the truck, including toilets, to fall over the side of the bridge and onto the northbound 170 traffic lanes, he said.

The debris covered four lanes and a carpool lane on the 170 Freeway. One vehicle was struck by the debris, Gomez said, adding he was not aware of any injuries.

“It could have been a lot worse, but it wasn’t,” Gomez said.

However, a CHP incident log stated that the driver of a Honda Accord pulled over and reported that he had glass debris in his eye.

CalTrans was dispatched to help with the debris cleanup. All freeways leading to that intersection, including the northbound 101, the southbound 170 and westbound 134, were affected, he said.

A SigAlert was issued at 6:04 a.m. for the northbound 170 Freeway at Moorpark Street in Studio City. At that time, all lanes except the HOV lane were closed.

Staff Writer Steven Rosenberg contributed to this report.