You and a car two lanes away both appear to be moving toward the lane between you. What should you do?
Correct answer: Delay your move until that lane is safely available.
Check the target lane and nearby lanes for vehicles moving into the same space. Signaling does not reserve a lane.
Source: Iowa Driver's Manual, MM1170 07/23/2026; printed page 44, physical PDF page 44; Changing lanes. Readable text only; no diagram interpretation used. ↗
You have been watching only the rear bumper of the car ahead. What would improve your hazard detection?
Correct answer: Scan farther ahead and around the roadway while also monitoring nearby traffic.
Defensive driving requires a broad search for developing hazards. Looking beyond the nearest vehicle gives more time to plan.
Source: Iowa Driver's Manual, MM1170 07/23/2026; printed page 47, physical PDF page 47; Defensive driving. Readable text only; no diagram interpretation used. ↗
Another driver makes an angry gesture after a traffic disagreement. What should you do?
Correct answer: Avoid engaging and create safe separation.
Do not turn a mistake or disagreement into a confrontation. Maintain control, avoid retaliation and separate when safe.
Source: Iowa Driver's Manual, MM1170 07/23/2026; printed page 47, physical PDF page 47; Aggressive drivers. Readable text only; no diagram interpretation used. ↗
A driver begins moving into your occupied lane without noticing you. What is an appropriate use of your horn?
Correct answer: Give a warning to help prevent the immediate conflict.
The horn is a warning device. Use it to alert someone to danger, not to express anger or replace a safe evasive response.
Source: Iowa Driver's Manual, MM1170 07/23/2026; printed page 49, physical PDF page 49; Communicating with other drivers. Readable text only; no diagram interpretation used. ↗
A severely sleep-deprived driver drinks an energy drink and feels more alert. Does that establish that a long drive is safe?
Correct answer: No; brief microsleeps can still occur despite feeling more alert.
NHTSA warns that coffee or energy drinks alone may not be enough. A seriously sleep-deprived driver can still have microsleeps; a temporary alert feeling does not replace adequate sleep.
Source: NHTSA; Tips to Drive Alert: Short-Term Interventions, item 1; official safety guidance read September 22, 2026. ↗
