Motorists in Tunbridge Wells have been taking direct action against workers replacing a pipe on a busy stretch of road by throwing eggs and golf balls at them.
South East Water has been forced to erect a temporary shelter to protect workers from irate drivers as they lay a new 1km-long section of water main on the A26.
A spokeswoman for South East Water said missiles such as cream cakes and CD cases have been launched, and there has been "a considerable amount" of verbal abuse directed at workers operating the manual traffic lights.
The company has now installed a "metal fencing arrangement covered in tarpaulin" to protect staff as they operate the lights until the work is completed next month.
The spokeswoman added: "While we have always acknowledged the frustration caused by delays, this sort of behaviour is clearly dangerous.
"It is unacceptable that our staff and contractors should have to put up with this sort of verbal and physical abuse."
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