Workers within a stairwell under construction .
The workers are construction workers
Workers within a stairwell under construction.
The workers are construction workers
There is more than one person, so they are workers.  They are near scaffolding and have orange warning vests on so are likely to be construction workers.
There is more than one person , so they are workers . They are near scaffolding and have orange warning vests on so are likely to be construction workers .