MARIETTA — Marietta police are looking for a hit-and-run driver who allegedly rear-ended Marietta resident Samantha Johnson, 29, on the northbound Interstate 75 exit ramp to Dobbins Air Reserve Base.

The accident occurred at about 6:30 p.m. Tuesday as the vehicles approached westbound Delk Road during rush hour.

Johnson described the driver as an African-American woman in her 30s with straight, shoulder-length black hair, wearing a knit sweater in a dark hue and driving a white Hyundai or Lexus sedan with extensive front-end damage.

“Her car looked really messed up. Both front lights were out. I don’t see how she drove away,” Johnson said Wednesday after being released from Northside Hospital.

Johnson, who is pregnant and due next month, was transported to the Buckhead hospital because that’s where she will give birth to her daughter.

“The baby’s fine. We’re still under watch for about a week,” Johnson said.

The expectant mother sustained soft-tissue damage to her neck and back from the seat belt and steering wheel of her 2008 black Saturn SUV during the 35 mph collision, which did not deploy the airbag.

“I’m really sore. I don’t feel so good,” said Johnson, who is taking time off from her job in Norcross at Christian hedge fund Chi-Rho Financial.

She said the other driver spoke with her briefly at the scene.

“She got out of her car, and I opened the door. I was already calling 911. She said, ‘Do we have to call the police?’ I said, ‘Yes. I’m 35 weeks pregnant. I need an ambulance,’” Johnson said.

Then the driver turned and fled, taking an exit lane going the opposite direction on Delk Road.

“She looked at me. She saw I was pregnant and got back in her car. I thought she was getting her insurance information. She actually got in the other lane of traffic and headed eastbound,” said Johnson.

Marietta first responders arrived within “minutes,” she said.

Johnson’s husband, Bobby Johnson, said he followed up with the police department’s hit-and-run investigator.

“Officer (Geoff) Culpepper said they did an extensive search of the area last night, but did not find the vehicle,” he said.

Bobby Johnson, an attorney with the Bhrett J. Pizza law firm in Marietta, said he is more concerned with the other party taking responsibility than he is with legal action.

“We want the driver to come forward,” he said. “She jumped back in her car when she saw my wife was pregnant. That makes me sick to my stomach.”

Anyone with information is asked to call (770) 794-5357.