One of the most common methods for ensuring worker safety is to promote watchfulness among employees. Workers are often trained to look out for their colleagues, from recognizing signs of health problems, such as hypothermia, to alerting each other to dangerous conditions such as slippery walkways.
But this training isn't effective for lone workers -- employees whose jobs require them to work in isolation from other workers and without supervision. These workers face additional safety hazards as, in addition to the risks present for all workers on a job site, lone workers cannot call out for help to a fellow worker in the event of an emergency.