Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Cumulative frequency of drowsiness-related events during the drive following the post-sleep drive and the post-shift drive, for severe driving impairment/emergency braking events (A) moderate driving impairment/lane deviations (B) moderate (JDS ≥ 2.7) and severe (JDS4.5+) ocular-based drowsiness events (C) and end-state fall asleep/microsleep events (D).
