South East Water is urging communities to be vigilant after a spate of vandalism to some of its temporary traffic lights.
Lights have been tampered with overnight, causing the system to shut down and delays to motorists.
Most recently in Woosehill, Wokingham, where the company is upgrading 930 metres of water main, the lights were damaged overnight, putting people at risk.
The firm is working closely with its contractor, Clancy Docwra, to investigate ways to deter potential vandals.
In the meantime, customers are being asked to be on the lookout and anyone who spots lights being tampered with should contact the police on 101.
Chris Lunn, Head of Health, Safety and Quality at South East Water, said: “We make every effort to ensure that traffic management is robust with regard to vandalism and perform regular monitoring to ensure that such equipment remains functional throughout the duration of any works.
“Despite these measures, some people make a determined attempt to vandalise our works and this presents a very real risk of accident with potentially serious consequences.
“We will do all we can to make sure that our street works remain safe, please could members of the public continue to report any vandalism to us by calling 0333 000 0365 so that we can take prompt action to keep your roads safe.”