Typically if I'm drafting, it's a decision to slow down and follow the truck. So, I check to make sure there is no traffic in front of the truck before pulling in behind it. That takes care of most of my concerns. I have no particluar illusions of being able to react behind the truck. My future aero car will have cameras mounted like antennae (sort of F1 style) so I can see around taller traffic.
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