Situational awareness is key, but if all other indicators suggested everything was fine and you were driving up a bridge at night, there’s not much warning before the road is suddenly not there thanks to the curvature of the road. I’ve seen plenty of short clips of cars dropping into missing road segments due to whatever reasons, and it’s just not something you look for normally while driving nor is it that easy to see from a distance vs. an obstacle on the road. It’s possible they tried to stop and just couldn’t in time. The vehicle would be farther away if they had just flown off and not right below the base.