I was stopped at a red light. When the light turned green, I stepped on the gas pedal to proceed forward. The vehicle suddenly stopped and shifted into Park on its own. The emergency brake light also came on, and the vehicle would not move. I attempted several times to shift the vehicle back into Drive, but it would not move. I continued shifting between Park and Drive and attempting to release the brake until the vehicle eventually allowed me to move. Because the vehicle would not move when the light turned green, another vehicle struck my vehicle. This created a serious safety risk because I was unable to move the vehicle when traffic began proceeding through the intersection, resulting in a collision. There were no warning lights, messages, or other symptoms before the incident. The vehicle unexpectedly did this without warning. The emergency brake light came on when the failure occurred. The vehicle has not been inspected by a dealership or independent service center, and the problem has not been reproduced or confirmed by a dealer or service center. The vehicle is currently available for inspection upon request.