I read a recent study of medical residents after call (read sleep deprivation). They score about the same as someone intoxicated. I have never DUI'd, but I have driven while talking on the phone, and sleep deprived. At least for me, the phone is worse. I just focus more on the phone than the road. When sleepy, I *know* it, and drive much more carefully to compensate for my poor reflexes and response times. Nowadays, I very rarely use the cell while driving, and only if I know it will be a few second conversation. Otherwise, I pull over for a couple of minutes.

R2-E2, 2G Prius.
Highway/City/Husband/Wife MPG: 56.5, as of 12/2005, 26K miles

Jac Nasser, Ford President: "We are planning to launch a hybrid version of
this car [P2000] within this year [1998]. We will also make FCEV available in
2004."