Exclusive: Vision has emerged of the moment an excavator was driven up to a speed camera in Adelaide and blocked its line of sight using its bucket.

Police are searching for the person behind the brazen act and warn it's a serious offence, carrying hefty penalties.

The incident occurred just before 6:00pm yesterday, when security cameras captured a person on the machine, manipulating the bucket, repeatedly moving until it completely obscured the speed camera, rendering it inoperable.

 Local workers confirmed that excavators are frequently left at the site due to ongoing works on underground gas pipes.

However, they say keys are never left in these machines overnight, but that there are some universal keys that could have started it up.

While some locals found it amusing to bloc

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