This is the shocking moment a box lid came loose and landed on the roof of a car driving behind.

The cover was attached to a plastic box at the back of a pickup truck when its locks unfastened, sending it hurtling through the air.

Dashcam footage shows how the lid was flung backwards before a loud thud was heard from the roof of the car in Bangkok, Thailand, on November 4.

Phuvadon Gomolrattanasathien can be heard shouting in panic before slowing down on the motorway.

The shocked driver said: "Fortunately, it did not hit my wind shield. Please be careful with loading stuff on your car and driving on the highway."

The box lid was made from plastic, but it still dented the roof of the car due to the impact.

Phuvaldon caught up with the pickup truck's driver and informed him about what happened through the window but it sped away and did not apologise.

He did not report the incident to the police since no one was hurt, but he's urging his fellow motorists to be more careful next time.