They weren't on the street when the vehicle moved. They were standing on the corner. The vehicle had a green light, but wasn't moving into the intersection because the intersection was blocked. The vehicle started to roll forward to approach the intersection, the pedestrians decided to cut across without a right-of-way light, and the vehicle stopped rolling forward when they entered the crosswalk. It then took longer than I would've expected for it to decide the coast was clear and to approach the intersection again.

Yes, I understand it is not actually thinking. I'm also a software engineer. The pedantism isn't adding insight to the conversation.