Firstly, the car would be restricted to the surface of a plane just like 3D cars are, using a planar "rail", as in 4D, planes can be hooked on to. The hook would only be a half hook, like an upside down U attached to the bottom of the car, as gravity would see to the vertical dimension, and having a full hook would mean it could bash into the rail supports, which wouldn't go very well (also, a half hook lets you raise the car off the road vertically for maintenance etc.)
To turn a bend along the plane formed by the frontal axis and the axis perpendicular to the rail (e.g. if the rail was in the xz axes and you were travelling along the x axis, the bend would be in the xw axes), you would not need to steer, as you do not need to move along the z axis (think of it as going up or down a hill in 3D, except no gravity is involved). To turn a bend along the plane of the rail itself, there are 2 options for road designers. The road could roll such that the bend is now in the first situation, meaning again no steering is required, or if there is no space for that, the road could just bend as it does in 3D, requiring steering. On motorways, the second option would not be allowed, so that steering would only ever be required for lane changes.
PWrong wrote:I'm not sure I get it. It sounds dangerously like riding a bike on a rope, with a hook on the bike in case you fall off. Or is it more like a train?
I don't see how the first option gives drivers a choice. If the road bends in such a way to allow me to go where I want, what if you want to go a different way?
Trionian airline pilots steer just fine in three dimensions every day...
Halfbaker wrote:Trionian airline pilots steer just fine in three dimensions every day...
Halfbaker wrote:My cursor also has two degrees of freedom, I have no difficulty pointing it where I want, do I?
Keiji wrote:You try to imagine flying a plane when there are a thousand more in all directions around you, and cylindrical lanes somehow marked out in the sky.
Yeah, that's quite a bit more difficult...
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