Stephane and Tyler pulled over just before 9 p.m. on Route 15 South near the Sparta-Jefferson line in Sussex County on Jan. 15.
They called for help and police responded within one minute.
Officer Christopher Botta arrived and seconds later, Stephanie delivered the baby girl into his hands.
Additional first responders arrived and helped monitor Stephanie and Millie. They were both wrapped in blankets due to the cold and snowy weather.
They were taken to Morristown Medical Center where everyone is said to be doing well.
They have since been invited to the Sparta police station for a visit in the future.
"As the chief I am very proud of my officers for taking this call to action with using their training and teamwork to help bring a beautiful little girl, Millie, into this world," the Sparta police chief said in a statement.