Which combination of behaviors does the CDL manual list as clues to an impaired driver (sleepy, intoxicated, on drugs, or ill)?

49 CFR 383.111(a)(13); AAMVA CDL Manual (nhcdm.pdf) Section 2.8.3, p. 2-20

Impaired drivers are unpredictable and among the most dangerous hazards on the road. Recognizing specific clues, weaving, odd stops, an open window in cold weather, lets you increase following distance and stay alert for sudden, erratic moves before they turn into a crash.