Driving in traffic, in the left lane about to pass a truck behind a line of cars also trying to pass the truck. This car was behind me tailgating me for so long and then went into the right lane to go around me even though there was no room for her between me and the car in front of me. She came into the lane anyways and cut me off completely, causing me to slam on my brakes because she was coming into my lane when I was practically next to her.