1) You need instrumentation, my friend!
2) Also, I tend not to draft. Even though you may be able to peek around the side of the guy in front, you're still missing a huge amount of visual information about what's going on ahead.
From a defensive driving perspective, when you draft, you more or less hand control of your vehicle to the driver you're following. If s/he brakes, you're pretty much forced to immediately brake also. It's reactive vs. proactive.
IMO, the real danger of having to brake unexpectedly at freeway speeds isn't that you're going to run into the vehicle in front of you. Obviously you're paying much closer attention to what's going on than the average no-brainer who typically follows too closely while chatting on the cell, etc.
The danger to you is from the vehicles behind you & the risk of a rear crash into your vehicle if you're ever forced to brake suddenly.
Just putting it out there. I for one don't recommend drafting.
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