from TFA:
4. The absence of a timely brake application, the cellular provider records indicating frequent texting while driving, the temporal proximity of the last incoming text message to the collision, and the witness statement regarding the driver's actions indicate that the GMC pickup driver was most likely distracted from the driving task by a text messaging conversation at or near the time of the accident.
9 The GMC pickup driver was fatigued at the time of the accident due to cumulative sleep debt and acute sleep loss, which could have resulted in impaired cognitive processing or other performance decrements.
And that's why texting while driving is bad, boys and girls. And not getting enough sleep will, apparently, make you stupid enough to do it.