If ever there is a traffic jam on the highway, you will see the big rigs consistently leaving hundreds of feet of space in front of them.
They also seem to concentrate in the center lanes of the highway for reasons I haven't figured out yet.
Most likely because if a lane is closed it will be an edge lane. Also, if you're on a 3 lane road and two lanes are closed, you only have to make one lane change to keep going.
Edit to add: It is a computer telling them how fast to go, usually something similar to http://www.scangauge.com/
That doesn't seem to be the majority here.
> ding ding ding ding! We have a winner.
I cannot speak for others, but, at least to me, this reads as extremely condescending: it makes it sound like other commenters are basically picking arguments at random and you are the only one to know the truth.