>> i have a question for mr. tefft. with regard to the data as we talk about, people generally having -- being more drowsy in general and you talk about the people reporting that they've driven while drowsy, have surveys looked at people's attitudes as far as the risks of driving drowsy, and if so, do people make that link between their drowsy driving and the risks? >> it honestly doesn't appear that they do. we have looked at that in surveys by the aaa foundation. and in those surveys we asked people how much of a threat they perceive other drivers, driving while they're sleepy, are to their own personal safety, as well as whether they consider it acceptable for a driver to drive when they're so tired, that they have a hard time keeping their eyes open. and consistently, a large majority of people report that they consider it a very serious threat to their own personal safety, that other drowsy drivers are out there. and are almost unanimously consider it completely unacceptable for a driver to drive when they're so ti