The estate of a woman struck and killed by a rental truck in a tailgating area at a Yale-Harvard football game in 2011 is suing the driver and others, saying they were negligent. The estate of Nancy Barry of Salem, Mass., is suing the driver, Brendan Ross, Yale University, the city of New Haven, and others. Ross in February received a special form of probation that will leave him with no criminal record. He pleaded guilty to traveling too fast and unsafe starting. Paul Edwards, attorney for Barry’s estate, said the city failed to ensure pedestrian safety. The city said that claims against it should be dismissed.