Which driving behavior most directly leaves too little space to avoid hitting the vehicle ahead?
Correct answer: C. – Following the vehicle ahead too closely
Iowa law prohibits following another vehicle more closely than is reasonable and prudent for the speed, traffic, and highway conditions. A sufficient following gap gives you time to react and stop if traffic ahead slows suddenly. The driver’s manual recommends judging the gap by time rather than by a fixed number of car lengths.
Source: Iowa Code § 321.307 — Following too closely., Iowa Driver’s License Manual — Ch. 4, § 4.4, “Safe Following Distance”

