Discription of Events: As my boyfriend and I were about to turn off the 11A onto Yasmin in Gilford the Jeep Im reporting was speeding up behind us and then right before I turned left went passed me on the left side on a yellow double line at a very dangerous corner going at least 20+ over the speed limit. If I didnt look behind me when I did. I would have turn into the path of the Jeep.