Why does an air brake system's slight lag between pressing the pedal and full braking force matter more with passengers aboard?

Pick an answer

1. It only affects how quickly the vehicle can accelerate afterward
2. It means the brakes should be pressed harder than usual to compensate
3. The driver needs to anticipate stops earlier so the eventual braking force doesn't catch standing passengers off guard
4. It doesn't matter more with passengers, the lag is the same for any load, since air pressure builds at a fixed rate regardless of weight

Correct!

Not quite. The correct answer is highlighted.