RRoad Rules Prep
Practice every question in the IA DMV Prep app — free on the App Store

Iowa Highway practice

Practice 16 Iowa DMV questions on highway. Answer interactively below with an instant explanation after every question.

Loading questions…

Example questions & answers

1

On a highway with three or more lanes going in the same direction, which lanes usually have the smoothest flow of traffic?

  • A.left lanes
  • B.right lanes
  • C.middle lanes✓
  • D.accelerating lanes

Why: On highways with three or more lanes, the middle lanes typically offer the most consistent speed and fewest interruptions. This is because they are positioned away from merging traffic on the right and high-speed passing traffic on the left.

2

Why must you maintain a constant speed when passing and reentering the lane in front of trucks or buses?

Illustration for question 2
  • A.shorter distances to slow down than cars.
  • B.less time to stop.
  • C.longer distances to slow down than cars.✓
  • D.less room to maneuver.

Why: Trucks and buses are much heavier than cars, so physics dictates they need more space to stop. If you cut in front and slow down, they might not be able to brake in time to avoid hitting you.

Take the full Iowa mock exam →

Practice material only — verify current rules with the Iowa Motor Vehicle Division.