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Once driverless cars catch on, I expect this sort of thing to be commonplace on the highway. Assuming driverless cars can communicate their intentions to each other and react almost immediately, you should be able to have packets of driverless cars drafting each other at a following distance of 250ms.
Considering we have automated parallel parking systems already, how long before we have big rigs that can say to the car(s) in their slipstream, "Hey, I'm about to brake!"
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