I know I saw another post somewhere about a cyclist going west out of Ocatillo, CA on I-8 and onto highway 80. He too noticed many times how two vehicles from opposite directions would come exactly abreast of each other and himself. It is obviously timed and coordinated and calculated. I have seen such tactics used many times for harassment, crowding and noise attacks. If you run into these criminals, you might want to be careful, wear earplugs, and call the police and try to get to the bottom of it. Where there is much traffic it might be difficult to discern, but when on back roads on a Sunday when you might see one car every fifteen minutes if even that, and two trucks and / or cars come exactly abreast of you a hundred times, and always in the same kinds of places, e.g., at the first expansion crack going onto bridges, where the side lane suddenly disappears, and where obstructions put in the side lane force you out into the motor lane, the conclusion is inescabable. It is organized, criminal-gang stalking, and I saw it clearly across five or six states.