QUESTION #1. When deciding on a power source to be used in a device i looked at the different types of power sources and decided on the advantages and disadvantages of each.
Magnetism - using magnets to draw in or repel other magnets. Advantages - inexpensive, reliable, offers frictionless movement. Disadvantages - not a common power source, will loose magnetism when exposed to heat.
Solar power - Solar power is the the conversion of the energy from the sun to usable electricity. Advantages - Solar energy is a resource that is not only sustainable for energy consumption, it is indefinitely renewable disadvantages - The primary disadvantage of solar power is that it obviously cannot be created during the night.
Air power - this is used in wind turbines, when the fan spins it turns a generator that converts the energy into electricity. The advantages - free clean energy, doesn't provoke asthma or make aicd rain such as from fossil fuels. Disadvantages - no wind no power, noisey, residents report "it looks ugly"
Battery power - A battery is a device consisting of one or more "electrochemical cells" with connections on the outside to power electrical devices. Advantages - portable power source, inexpensive. Disadvantages - some batteries are dangerous and can lead to fire, batteries can be used for only a limited time
QUESTION #2 "How to harness the power for my APV"
By producing or sourcing large strip magnets, a tunnel floor could be filled / lined with (industrial sized) strip magnets, and also have them attached to the undercarriage of vehicles. When approaching the tunnel the vehicle would engage with the floor and they will hover or levitate as they passed through the tunnel frictionless. Magnets would also be added to the side of the tunnel and the side of the car so that it will keep it distance and not crash so the driver or passengers will have the safest experience possible. There will also be magnets on the front and back of the car so other cars will avoid contact.