Yeeeeaaa.... 120+ on a highway where people are normally driving anywhere between 60-80ish... can't say anything good to justify that. People in cars aren't going to have a whole lot of time to react to a 120+mph speeding bike. Some moron drivers don't even check blindspots anyway- let alone fully examine whats going on behind them. Tragedy like this sucks, but your odds at survival on the streets are pretty slim if you're going to make an insanely risky decision like this guy.
As far as chasing another rider, they teach you about this sort of thing in the MRA/MSF school. This is a textbook example of the kind of tragedy that can happen when one rider, new or experienced, is trying to catch up to someone else in traffic. Would you rather pull over, call the guy and have him meet you somewhere or become a mangled dead body on the side of 275? Ride smart, people. RIP to the rider.
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fear is your only god