Warning signs
Traffic signals ahead that only operate at certain times
What it means
The "Part time signals" plate under the traffic-lights warning triangle: the lights ahead only run at certain times of day, so they may be dark when you arrive. You meet them outside some schools and works entrances. Approach ready to stop, and if the lights are off, go by the road markings and take it slowly.
Highway Code Rule 146 — read it on GOV.UK
More on signs like this: Warning road signs explained: junctions, bends, narrowing roads and hazards
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Sign images: Department for Transport, © Crown copyright. Used under the Open Government Licence v3.0.