Which highly-anticipated personal transportation device, unveiled in 2001 after massive secrecy (codenamed 'Ginger'), failed to revolutionize urban mobility despite $100M+ in development and early celebrity endorsements?

The transportation industry has seen countless innovations over the decades, but not all products make it to success. Some spectacular failures teach valuable product design lessons. This trivia focuses on one of the most notorious transportation product failures of the early 21st century, which had tremendous hype before its spectacular downfall. Test your knowledge of transportation product history!

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Segway PT
Sinclair C5
Moller Skycar
Toyota i-Road