Can't even detect and slow down when it 'saw' presumably the van driver waiting on the edge of the motorway. May be they programmed to ignore humans on the edge of the motorway because that's unlikely...

"Duhhh... excuse me Sir, but we think you may have memorized some information - please step this way, our surgeon will need to remove a part of your brain that we think may hold sensitive information....Oh and Welcome to the USA!"