As I was about to change the lane on I-285 E to get on exit 29 towards Ashford Dunwoody road, the driver of this license plate sped her vehicle from the exit merging towards I-285 E forcing me to get back in my lane. Startled I honked to alert the driver and moved to exit lane. She then aggressively cut in front of me and threatened to brake stop a couple of times. My two little kids in the car shrieked out of fear as I had to apply brakes in reaction. She then hopped on to left lanes and kept changing lanes aggressively, threatening the safety of fellow drivers. She could have been high or simply reckless at that time, if not for low traffic I am sure to have ended in a nasty accident with her.