What must you reckon with when you see this traffic sign?

You correctly identified all points related to this sign. This triangle with a worker symbol is a general warning for road works. It alerts drivers to expect men working on or near the roadway, which means you must drive carefully. In addition to workers, you should also anticipate the possible presence of road construction vehicles and construction materials on the road. All these factors can affect traffic flow and require increased attention and possibly reduced speed to ensure safety for both workers and drivers. Recognizing this sign means preparing for hazards associated with ongoing roadwork.