Call it the Eureka Moment: The sudden, blinding flash of inspiration that leads to a new product or company. We asked four inventors to share the story of theirs.

The Problem: One morning in 1982, Woodbury was stuck in rush-hour traffic on L.A.'s Interstate 405. Ironically, the day job he was crawling his way to was selling Porsches.

"There was one car per driver, one car per lane," says Woodbury. "But effectively, four times that space was wasted in unused seats and trunks." ...

Call it the Eureka Moment: The sudden, blinding flash of inspiration that leads to a new product or company. We asked four inventors to share the story of theirs.