thinglets: Why Do Freeways Come to a Stop?

While I can accept the general premise and scientific conclusions in the annotated diagram above, I do think that some of the more creative reasons for highway stoppages are missed within its limited scope:

1) Hot coffee accident
2) Text messaging at 120
3) Oral sexcapades
4) Sleepdriving
5) Trying to find a playlist on an mp3 player
6) Tilting one's head back to talk into the Bluetooth speaker four inches above one's head
7) Roadkill, or soon-to-be roadkill
8) Air guitar solos inspired by classic rock stations
9) Nickelback song inspires self-immolation
10) Out of reach Cheeto