In this illustration of the caravan analogy, we see a line of cars, labeled "Ten-car caravan," heading from left to right. The first car in the caravan has a reached a toll booth. To the right of this toll booth is a second toll booth, and the distance between them is given as 100 km. A distance of 100 km is given after the second toll booth as well, and we can imagine that there is a third to come, and more beyond that one.