From your artciles,
"The state Department of Transportation had shut down interstates at 5 p.m., so it remained unclear how the truck got on the interstate.
During a late night press conference Corrections Commissioner Paul Schnell said there were traffic diversions in place during the protest. "It appears as though the driver attempted to get around, did get around and ultimately entered that area,” he told reporters."
Translation - WE HAVE NO IDEA WHAT HAPPENED.
From your 2nd article "A witness said he saw the truck "barreling down, blaring its horn" without appearing to have any intention of stopping, as protesters gathered peacefully on Interstate 35W.
"You heard a horn," he told KARE 11's Boyd Huppert. "It was barreling into that crowd and they were separating, just parting, thankfully."
Translation - NOT ON PURPOSE, there is no other explanation of him blaring his horn, other than to warn people he was coming....
"State Corrections Commissioner Paul Schnell said at a later briefing, however, that the truck went around a traffic barrier to stay on the road."
Now you have articles contradicting the facts.
As far as the truck being stopped, it was stopped, it's not a corvette, it doesn't go from zero to 60 in 3 seconds, it would take a good while before it got up to speed again, it was neutralized from being a threat