"There's interesting research that people who jump into taxis are less likely to wear a seat belt than if they're driving their own car," says Kraemer. Why that may be is itself a mystery, he says, but understanding why is on his docket. "That's the next step of what we're hoping to do."
Danielle Kurtzleben is a business and economics reporter for U.S. News & World Report. Connect with her on Twitter at @titonka or via E-mail at firstname.lastname@example.org.