I use a different tactic on two lanes, I see a car approach me from behind, I have two main possible assumptions, they are driving faster then me or a cop, and two, they likely will want to pass sooner of later . I then move as far to the right as safely possible, to give them a good view of oncoming traffic, it also lets them understand I know what I expect them to do, and gives all three(?) drivers the room to almost go three wide everything goes figuratively suddenly sideways, like a blown tire, misjudgment of closing speed, a spilled hot coffee, etc. Heck, I will even drop my speed if its needed to not be witness to a headon initiated by the passer. Even though I suspect my "rights" say I don't have to.