Any reason why giving wide berth is not sufficient? I also have a very bright rear set up and have never experienced anyone slowing down on 55mph roads when there is sufficient room to pass to me. In my experience very bright lights do have the positive effect of inducing motorists to make their passing maneuver sooner rather than later which IMO is the desired effect. Drivers needlessly slowing down to 15 mph to pass on 55 mph roads would create a hazard for me.