Some people wonder what the attraction of doing all this on a motorcycle is. Why not do it in the comfort of an air conditioned car? The answer can be found in Robert M. Persig's book "Zen and the Art of Motorcycle Maintenance."
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In that book, published in the same year as I got married (1974), the narrator is travelling across the Central Plains of the USA on a motorbike. In the very first chapter he sums up beautifully the appeal of travelling by motorbike.
"You see things vacationing on a motorcycle in a way that is completely different from any other. In a car you're always in a compartment, and because you're used to it you don't realise that through that car window everything you see is just more TV. You're a passive observer and it is all moving by you boringly in a frame.
On a cycle the frame is gone. You're completely in contact with it all. You're in the scene, not just watching it anymore, and the sense of presence is overwhelming. That concrete whizzing by five inches below your foot is the real thing, the same stuff you walk on, it's right there, so blurred you can't focus on it, yet you can put your foot down and touch it anytime, and the whole thing, the whole experience, is never removed from immediate consciousness."
So there's your answer. I've also seen a T-shirt that sums it up in just a few words - "If you have to ask, you wouldn't understand the answer!"