I heard this also and was told it was the basis for the charges and convictions. The driver supposedly had the brakes fail and still went past the runaway truck lane that would have stopped him. This made his behavior reckless enough to support the charges.
I am lucky and never had a truck runaway on me like that, though I have had a few scares at times. Having said that, I still have trouble believing that this was provable and reckless enough to support that many charges. My other problem with it is the DA put that many counts of each on to try to force a plea bargain. If the DA knew the law required consecutive instead of concurrent sentencing, he should have known this result would come about. I believe the DA was not looking for justice or fairness, but wanted a conviction at any cost. Now most of Colorado is asking the governor for clemency and the legislature to change this law.