5.3.2. Relationship between frequency and consequence of collisions
The individual risk implies that the risk can be aggregated into a single number. For example, the expected human life loss per year is an individual risk which is a product of the occurrence frequency and occurrence consequence. However, note that a single number cannot address the relationship between the frequency and consequence. The F/N curve is the most common form to illustrate the relationship between the accident occurrence consequence and the corresponding occurrence frequency. The accident consequence (i.e., the number of persons being killed) and the corresponding frequency are shown on the abscissa and ordinate, respectively.