The problem is that, even though the lights are temporary and / or not working, it is still illegal to go through a red light. And, with the way that the police act these days anyone using commonsense still has a good chance of getting a ticket from one of our wonderful uniformed tax collectors.
Here’s a quote from a lawyer specialising in road traffic law on another forum ”
If the lights are not working properly, the potential defence is that they do not comply with the appropriate regulations and thus, you should not be prosecuted. However, it would be for the Defendant to establish that “to proceed with caution” was a reasonable action and that it was apparent that the lights were not working properly.”