By Emilia Randall Two three-year-old twins were found dead in a car on the side of a highway after the driver jumped off an overpass and critically injured herself. The brother and sister were found unresponsive in a silver SUV parked along Interstate 95 in Miami early Friday morning, a passerby attempted to help with CPR on one child but failed to resuscitate them. Emergency services received multiple calls about the twins in the backseat of the car at one of South Florida’s most busy spots. The relationship between the woman and the children is still unclear. The female driver had jumped off…