I’m glad they got him but those are not “boulders” they’re just typical Sacramento river rocks. Lots of people use them as landscape accents in that area.
Good Irish name there
So he was just landscaping the freeway.
In geology-speak, a boulder has to be at least 10.1 inches in diameter. But yeah - in layman’s terms, these are “rocks” - whether they are cobbles or boulders. Regardless - deadly when dropped on cars.
I’d charge him with multiple counts of attempted murder and put him away for life, with no possibility of parole.