Re: What's the point?
Most USA trucks do not have the side barriers on their trailers (which is mandatory in the EU) the problem is the car is probably perceiving the trailer as an actual Bridge if these trailers had the side impact barriers that should be enough for the car to actually see it the problem is he was traveling at highway speeds so even if it did see it it wouldn't have braked anyway automatic brake system would have not engage because it would have ignored it as being a static object which happens on all cars that have automatic braking when you're travelling above 20 30 mph