> There was a movie...
I'm pretty sure there is an early scene in the movie Solar Crisis[1] that plays out similarly to what you're describing. This movie was on one of the cable movie channels when I was growing up, so I got a higher-than-normal dose of it.
I don't remember a cow, though (but then this probably isn't the only sci-fi movie out there with such a scene). I think one of the characters first parked a motorcycle in the road, but the truck plowed through it. After that, they stood in the road instead, and that caused the truck to screech to a stop right in front of them, blasting a message on a PA about how they were breaking the law by impeding it.