Dr. Sherman House, the Real Dr. House™, https://civiliandefender.com/ was an armored truck guard for quite a while. He turned me on to the fact that such robberies often begin with unannounced gunfire by the robbers. When I see an armored truck at a grocery store or other place, I wait in my car until after it leaves.
Armored truck guard shot in the face during robbery attempt at NE Houston bank, HPD says
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We know from the Miami/FBI gunfight after action review that said robbers would often just open fire on the armored car crews.
I also hang back and watch when I see cash deliveries. Most of the time it’s one guy carrying a very big bag of cash into or out of venues such as stores, while not laying attention at all.