While I was under cover, there was a construction crew working in the road in front of the building with metal pipes in their hands. They also had a trailer or cart with numerous other pipes on it. The three men were not using a tool at the time and so there should have been no reason they could not hear the thunder.
When the thunder sounded, they did not bat an eye. They kept working. I paused a moment to see if they altered their routine but the answer, while was watching, was "no."
The storm that spawned the lightning was moving due north so the relative lightning danger was increasing. NOAA has a graph that illustrates the issue.
When thunder roars, go indoors. Or, at least, get into your car or truck which gives adequate protection.