I envision an entire transport paradigm of transport pallettes, thatare basically like a transport cab of say 1x3 meters, with 2 hugeflywheels on each end. On the flywheel are magnets. Electro magnetsembedded in the road, pulse by a central supercomputer to drivea whole paragidm of thousands of vehicles across a space, withoutthemselves needing any motors or noisy engines of any sort, ratherthey can be completely silent for the tyres. The system would beparadigm wide, like a pallette system of an automated shippingwarehouse. With the flywheels at speed, a vehicle could be hurledacross wide spaces at aeroplane speeds, on a coordinated horizontalelevator system, like imaged in minority report, but with a fullintegrated supercomputing and packet switching network tocontrol traffic.
Why not separate the rotor of an electric moter and put thewindings in the ground, the level of control, given moderncomputing would be to the milimeter, with the occupant feelingminimal acceleration. Laser sensors along the track coulddetect anything breaking the beams, and force the cars to slowto animal or pedestrian speed.
Here is another thread attempting to describe:http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=104x2917002
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The concept of putting the power source in the road instead of the vehicle parallels an electric railroad system which is quite a bit less expensive in infrastructure than the system you suggest. Doubtless an electric railroad is more conservative of energy and less threatening to the ecology (depending on the prime source of electric energy) than the current prejudice towards trucks but there is a large sacrifice in flexibility as it is not (at least so far) economic to power all roads from the broad highways to the individual citizen's side roads.