Streetlights may not turn on when they are programmed to due to an ongoing problem related to when the clocks change.

Clocks will go forward by one hour at 1am on Sunday, March 30, as British Summer Time begins but Hertfordshire County Council (HCC) has warned that some streetlights which are meant to switch off between midnight and 6am may be affected by the change.

In the week before and after the clocks go forward, HCC has said it is possible some streetlights will not turn on for one night, before resuming the normal part-night operation the following day.

The problem was first reported to the Comet in October 2012 when the clocks went back.

Terry Douris, cabinet member for highways at HCC, said: “We continue to work with the contractor – Amey Lafarge – who supplied the part-night streetlight timing devices to get them to resolve this issue. We expect Amey Lafarge to fix this soon and at their own expense. We are very disappointed that this hasn’t been resolved by now, despite our persistence.

“We want to make residents aware of this potential issue so that if you spot that a light hasn’t turned on for one night, you’ll know why. I apologise for any inconvenience or concern this may cause.”

Faulty streetlights can be reported via www.hertsdirect.org/highwayfaults