The East of England Ambulance Service has designated staff in their central control room who look at every 999 emergency call in real-time. NARS members can be contacted any time of the day or night should any of the criteria be met for immediate dispatch. Incidents that trigger an immediate response include Road Traffic Collisions (RTCs), falls from height, cardiac arrests and serious injuries sustained from assault or industrial accidents. The most serious medical emergencies can be harder to determine from the initial 999 call, however in certain circumstances, a call-handler will ask for further information before dispatching NARS.