Silver Alert

This evening, driving home, we saw an overhead message on Loop 101:

"SILVER ALERT",  a vehicle description and plate #

Here's the explanation from Arizona Department of Transportation (ADOT) in 2014:

"When it comes to delivering important safety and travel info to motorists on the road, ADOT’s growing system of overhead message boards... helps get the job done. Now, those boards have a new task…"

"In addition to commute times, travel alerts and various safety messages, the digital signs will also inform drivers of Blue and Silver Alerts."

Similar to Amber Alerts, Blue and Silver Alerts are issued by law enforcement officials to notify and seek help from the public.

Silver Alerts will be issued following the report of a missing person who is 65 or older (there are several other conditions that must be met before a silver alert is issued – get all the details by reading the law's entire text on the state legislature's site). 

Blue Alerts will be issued following an attack on a law enforcement officer if the suspect has fled the scene of the offence (again, there are several conditions that must be met – details may be found within the law's text)."