But the truck wasn't going full speed as he had the stop sign, right? At most he would have been going 30 kph as he got that monster load up to speed. Unless he blew the stop sign but that seems unlikely as the plant was only a half hour away so he should have been familiar with the route unless he was new to the job.
This is a Twitter comment from someone that apparently has a similar job:
This is a super B loaded with peat moss, I drive this every day and it’s scares the s*** out of me. Especially when that weighed at most 130,000 lbs. Sometimes I think I chose the wrong career after seeing this horrific accident.