I was in the right lane, of two lanes, proceeding north. I had waited at a red light, the second car back from the cross street. The light turned green and I was slowly proceeding, maybe going about 15-20 mph. Suddenly, the car engine raced and the front of the car veered left. There were cars in front of me, in the lane to the left of me, and behind me. I had both of my hands on the steering wheel the entire time. I, of course, took my foot off the gas pedal and applied the brakes. The brakes were not stopping the car. The car took off and was uncontrollable. I hit the car in the lane to my left, traveled across the same lane, then luckily ran up a curb and onto a median that had grass on it. The car was out of control and moving swiftly. I steered it to the right and off the median (which avoided hitting oncoming traffic head-on). The brakes were not stopping the car. I heard and felt that the car was hitting things: the car to my left, the median, etc.) I think the car may have spun 360 degrees, one complete revolution, and then jumped the curb and went up onto the median again. Again, I steered to the right to avoid crossing the median. The car then spun 180 degrees, and stopped perfectly facing south in the left northbound lane. (I thought I had gone up the median two times; however, maybe it was only once, as my passenger thought. I don't know if it was once or two times up the curb and onto the median. It all happened so fast.) Car was towed awa