People in the Mid Sussex area today (Wednesday May 14) may see far more blue flashing lights than normal.
Emergency services and other agencies are carrying out a live exercise at locations in Mid Sussex, Brighton, Eastbourne.
This is a large-scale exercise testing real-time response to a number of major incidents.
Most training takes place out of view but this exercise will take place in public, albeit in designated areas, to make it as realistic as possible.
The activity will be centred around Mid Sussex, Brighton and Eastbourne. Residents and businesses nearest the activity have been made aware, although police say they should not be affected.
Exercise planners do not want to be specific about what the exercise involves or where the locations are to make the spontaneous response to these emergency situations realistic.
Exercise director Steve Voice, Sussex Police, said: “Local people may notice considerable emergency service activity in these areas today. They can rest assured that far from having anything to worry about, this is actually a prudent test of our major incident plans and how we work with partners.
“It is extremely beneficial to the police and other agencies to test contingency plans, as directed by the Home Secretary, in a practical way and to continuously improve our service.
“The scenarios we are testing are exceptional and are of a magnitude that allows us to test all the likely resources available.
“The exercise will be conducted in designated areas and disruption, other than maybe short delays to traffic caused by emergency vehicles responding to the exercise, will be kept to a minimum. The public will not be affected and can expect business as usual with emergency services responding to routine and emergency calls.”
Nearly 20 partners - colleagues from fire, ambulance and police as well as some local authorities, health services, Highways Agency and others - are taking part in the exercise in line with their statutory duty, under the Civil Contingencies Act 2004, to plan, train and exercise a co-ordinated response to incidents that may affect Sussex.”