When Lyft driver Tramaine Carr transports seniors and sick patients to hospitals in Atlanta, she feels like both a friend and a social worker. “When the ride is an hour or an hour and a half of mostly freeway driving, people tend to tell you what they’re going through,” she said. Drivers such as Carr have become a critical part of the medical transportation system in Georgia, as well as in Washington, D.C., Mississippi, Arizona, and elsewhere. While some patients use transportation companies solely dedicated to medical rides or nonemergency ambulance rides to get to their appointments, the San…