Our plan had been to round the end of the Ningaloo peninsula (Cape Range National Park), do a little snorkeling at such stunning beaches as Oyster Stacks, then double back to Coral Bay.

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Mitchell envisages stacks of cars at various points around the city, such as outside subway or bus stations, solving what he calls the "last mile" problem of getting home from a central hub.

CNN: Reinventing the wheel