Sometimes the cars accelerate on their own. Sometimes they stop dead.
Suddenly she felt the car hydroplaning out of control, and when she glanced at the speedometer she realized the car had shot up to 84 mph. Riner wasn’t hydroplaning; quite simply, her Prius had accelerated on its own. She pushed on the brakes but they were dead. Then just as suddenly as the car had taken off, it shut down.