From the ADOT Archives: Dust Storm Warnings

Back then, ADOT couldn’t utilize Twitter, Facebook or a blog to advise drivers of an impending dust storm, but the agency did have changeable message signs on I-8 and I-10 that were used to signal “Dust Storm Alerts” and refer drivers to the radio stations where dust storm advisories could be heard.

Crews install a "dust storm alert" sign on I-10 (6/2/76).

So, while there were no #HaboobHaikus being written in 1976 (at least that we know of), there was still a need – as there is today – for ADOT to communicate important safety messages with motorists.