Just last night I pulled up to an intersection, the car in front of me hadn’t stopped in time and was half over the stop line, therefore when I stopped I gave them a length an a half of buffer so they’d have room to back up.
It’s defensive driving, we constantly encounter situations where we recognize the potential for a collision and take action to avoid it.
This is one of the toughest things for self-driving cars to pull off. It doesn’t mean it’s unsolvable, this shuttle might just have been a particularly poor AI, but it is a problem they need to solve.