Only one unit left.
I seconded guessed again and changed from 4 feet and gone one wrong.
That makes 3 wrong out of 70. Not bad, but I should not change the answers once I select it.
The answer was.
To lower the probability of a collision, try to maintain at least one car width of space to one side of your vehicle at all times. When possible, it is best to maintain space on both sides of your vehicle. When you must drive through an area with less than one car width of space on the sides, reduce your speed to allow more space to the front.