I was driving the car in stop-and-go traffic on a city street. After another stop, the car in front of me started moving. I pressed on the accelerator with the usual force, but my car took off like crazy. I pressed on the breaks, but the car didn't seem to respond to the brake pedal and ran into a car in front of me. Automatic emergency breaking system didn't engage as well. Luckily, nobody was injured. Had there been any pedestrians crossing the street, they would have been badly injured or killed. This uncontrolled response from the car is very dangerous and I cannot trust it anymore. As a result of this accident, the car in front suffered damage in the amount of a few thousand USD, and my Tesla Model X - $40k.