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Minnesota Department of Transportation
The purpose of this reference guide is to provide local agency staff a resource on four intelligent warning devices (active warning signs) that includes a general explanation on the use of the sign and their effectiveness, recommended installation protocols, alternative countermeasures to consider and maintenance considerations. With this guide, agency staff can identify whether implementation is warranted and further provide sourced responses to citizen’s requests for them. The four intelligent warning devices covered in this reference guide includes:
• LED Enabled Signs,
• Radar Speed Feedback Signs,
• Rectangular Rapid Flashing Beacons, and
• Dynamic “No Turn on Red” Signs.

Nevertheless, the information provided must be used with engineering judgement. Due to the differences between urban vs. rural environments, city vs. county agencies and staff availability, there is no one size fits all approach. This document provides general guidance that should be modified to meet each agency’s needs.
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