<human>:  I have a question about truck platooning. Why is it that trucks can drive so closely together?
<bot>: Truck platooning is a technology that allows trucks to drive very closely together. The idea is that the trucks can save fuel by drafting off of each other. This is done by having the lead truck control the speed of the following trucks. The lead truck can also control the speed of the following trucks by using a system called a “platooning controller”.