Intelligent Roadway Information System


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A beacon is a light or set of lights that flashes toward oncoming traffic. Sometimes called flashers or wig-wags, their purpose is to draw attention to a DMS or static sign.

Internal and external beacons are supported by IRIS. Internal beacons are controlled through the DMS controller, are activated through the NTCIP DMS protocol and are considered part of the DMS. External beacons use dedicated controllers and protocols (e.g. MnDOT-170).

Beacons can be controlled by action plans by using beacon actions.


Whenever a beacon is activated or deactivated, a time-stamped record is added to the beacon_event table. These records are purged automatically when older than the value of the beacon_event_purge_days system attribute.