SIF exposure is the frequency and duration with which people are within reach of a hazard that could cause a serious injury or fatality, such as a moving forklift or a raised load.
Exposure turns SIF prevention from a count of past outcomes into a measure of current risk. A site can estimate it by counting pedestrian and forklift interactions at crossings, hours of mixed traffic in an aisle, or the number of people who enter a dock or charging area during a shift. Detection systems and RTLS tags make this easier because they record how often and for how long people and trucks share space, but manual observation and time studies also work.
Reducing exposure is often a direct and durable control: rerouting a walkway, scheduling replenishment outside picking hours, or keeping pedestrians out of an aisle while a truck works it. Exposure is not the same as a precursor, which is a missing or failed control, and a high exposure figure is not by itself a sign that controls are failing. The SIF exposure article sets out a method for identifying exposure in forklift operations.