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Interior design factors and height above the ground will affect visual cues. Varying the radius as the cars go through turn can prepare the rider for gradual increase in g loading. There are likely ways to determine optimum rates of change to allow for comfort at loads up to 0.5g laterally. Check Wikipedia for information on the European conglomerate ABB.
Route planning is critical both for speed and customer access. There will be a speed differential that determines the cost and convenience choice a consumer will make between public and private means of transportation. We consciously compare out of pocket expenses for various modes of transportation but not always assign a value to our time in transit and recovery. It is this more complete calculation that business travelers and parents make subconsciously that I quantify now that led me to faired bicycles. Within a range of one hour of travel there is a speed for which the bike is more convenient and economical than a car. The break even point has been 17 mph so I set about building a bike that an average person can use to comfortably attain that speed. The 20 mph electric urban bikes will also be such a bike with fairings extending the range.
I would prefer to get out of my car and walk about a train on a trip longer than two hours especially with children. Elderly folks tend to use the bathroom more often than younger adults and our boomer population will continue age past the point of driving safely.
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