Ok so new rider, my odometer on my bike reads 270kms and I have just started riding in traffic. This was the heaviest traffic I have been in. We were on a one lane road, going in a straight line, speed is 70km/h. The lane is actually a bit wider than a normal single lane, its a generous size. Perhaps its a '1.5' lane, but definitely not wide enough to fit 2 cars. The traffic is bumper to bumper and I am riding in the right wheel track of the car in front (giving it some distance - maybe this is what promoted this), closer to the right side of the lane since that is where the car in front is driving. Evidently some biatch in a black lexus 4wd took this as an invitation to share the lane with me and came up from behind next to me on my left. I have no idea why, she still couldn't get past the car in front, it was double lines and of no help to her. What should I do here and what could have I done to prevent this uncomfortable spot? Perhaps I should have been in the center so she couldn't move up next to me? Anyway, I slowly started to lose speed and ended up slotting in behind her... so she had essentially overtaken me on a 1 lane double line piece of road. I didn't know how fast to drop speed either because I didn't want to do it too slowly and move into her blind spot and have her forget I was there and move all the way across on top of me, but on the other hand I didn't want to do it too fast because the cage behind me may not slow down. Advice?