That link seems much more comprehensive than my original Sky link. It says that the driver was not 'impaired', presumably not drunk or drugged up, then?
Do American trucks have Tachographs to record drive/speed/rest etc?
I'm assuming that US trucks do have similar record keeping to here.
However, the speed limit is 75mph on that road.
I've been following this story since this morning. It was very clear that the driver was co-operating and intoxicant free from all the reports I've read.
Unfortunately, it looks very like a fast moving truck/van came upon a slow moving convoy of cyclists-van-cyclists and totally misjudged the situation.
Initial reports suggested the group were on the hard shoulder, but later reports are suggesting they were taking the lane.
Having some experience of the roads (not on a bike in Nevada) I can easily understand how something like this can happen, unfortunately.
When I was cycling in the US I often was very thankful that I was alone. The anxiety of waiting for a partner after a bad stretch of close passes would be horrible.