Durham County Council has apologised to traders who lost thousands of pounds because of Lumiere, the light festival which attracted tens of thousands of people.
Shops and businesses on Elvet Bridge say customers were diverted away from the area at one of their busiest times of year.
Lucy Taylor reports.
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Changes don't affect houses, flats and other residential premises but during office hours automatic alarms will not be attended to.
Northumbria Police say two men have been charged with murder following the discovery of a woman's body in a burned out car on Tuesday.
It is 'allotment week'. Never one to miss an opportunity - Ross has dodged the showers and headed off to his for this weekend's forecast.