Emergency Broadcast Systems have been deployed for hundreds of years, and there is evidence to show that as early as the 9th century during the Arab-Byzantine wars, beacons were used to warn of invasion. Modern tests have shown that a warning could be passed over the main line of beacons, 450 miles in length in under an hour. Beacons were used in Elizabethan England to warn of the approaching Spanish
An emergency notification system, especially when coupled with other methods of dissemination of information, can be very effective as shown in a number of case studies covering the last few years. In May 2010, a water pipe broke in Boston leading to unsanitary mains water affecting approximately two million people and it was felt necessary to use the Emergency Notification System to issue an alert to all residents asking them
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