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The Strategic Highway Research Program 2 (SHRP 2) Naturalistic Driving Study can provide the data that are needed to provide inattention performance measures associated with precrash situations. This report summarizes research to determine the relationship between driver inattention and crash risk in lead-vehicle precrash scenarios (corresponding to rear-end crashes). It develops inattention-risk relationships, describing how an increase in inattention performance variables combines with context in lead-vehicle precrash scenarios to increase risk. The inattention-risk relationships are intended to show which glance behaviors are safer than others and pinpoint the most dangerous glances away from the road. A glance is the time from the moment the eyes move toward an area of interest (such as the radio, rearview mirror, or forward path) to the moment they move away from it. The results aim to (1) support distraction policy, regulation, and guidelines;(2) improve intelligent vehicle safety systems; and (3) teach safe glance behaviors. In line with previous naturalistic driving studies, the results show that some activity types significantly increase risk (such as texting and the aggregate category of portable electronics visual-manual). However, for talking/listening on cell phone, a strong significant decrease in risk was found. Notably, there were no crashes while talking/listening on the phone. Three types of glance metrics showed the largest odds ratios:(1) the proportion of time the eyes were off path between 3 seconds and 1 second before the crash or minimum time to collision,(2) mean duration of off-path glances, and (3) the mean value of a …