Risk assessment

Today I saw someone update their feed with "Stuck in traffic [...]". I'm hoping that a passenger sent the message, but it is likely that the driver, while stuck, decided an update wouldn't hurt. Oddly, in the same feed is a message "[...] school bus w/o seat belts [...] Should I just drive her & pick her up?". For some reason there are people that think that buses (even without seat belts) are less safe than cars, and that sending updates from cars while driving doesn't increase risk. Here are some statistics:

Number of deaths per billion based on one hour of risk exposure (from the book 'Dangerous Places'):
Rail or bus in the United States: 10
Traveling by car: 1200

Increase of crash risk due to sending a text message from a car: 23x.