From Sections 3 and 10 of the Michigan Motorcycle Operator Manual

Michigan Motorcycle Alcohol, Drugs, Fatigue and Weather Practice Test

BAC, impairment, fatigue, cold, heat and night riding.

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You're riding home after dark. What should you wear to be seen?

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Alcohol, other drugs, and riding
Alcohol is a major contributor to motorcycle crashes, especially fatal ones: studies show nearly 40 percent of riders killed in crashes had been drinking. Alcohol and other impairing drugs weaken your judgment, blur and slow your vision (even causing double vision), and slow your reaction time. p. 16
Don't Drink or Don't Ride
The safest choice is not to drink and ride: once you start drinking, judgment goes first and saying no gets harder. p. 17
Other impairing drugs and riding
Many prescription, over-the-counter and illegal drugs can affect your ability to ride. p. 17
QUICK TIPS: The Importance of Riding Unimpaired by Alcohol or Other Drugs
The MSF tips in the Michigan manual say any alcohol in your body raises your chance of crashing about five times, and a BAC above 0.05% about forty-fold. p. 18
Explanation: Alcohol Affects Your Ability To “SEE”
Alcohol weakens each step of the SEE strategy: it impairs vision (Search), judgment and decision-making (Evaluate), and coordination and reaction time (Execute). p. 18
Cold weather
In cold weather wear a windproof jacket and insulated layers you can remove as needed, topped with a windproof outer layer. Cold significantly lengthens your reaction time, so reduce speed and increase your following distance and the space to your sides. p. 62

Practice material, not the official test: check every answer in your state's current handbook. Disclaimer