"Being faced with a baby being born in a vehicle vs potentially in a hospital where the survival rate is so much better then he took the right course of action. He did the right thing for the community and the right thing for that family.
"We don't ever condone speeding. And that was his purpose of stopping that vehicle. It doesn't really matter whatever the speed was, we don't condone that."
She said police officers had to use their discretion and make decisions around speeding infringements and their circumstances everyday and this was no different.
"It's not always that you wouldn't give an infringement, but it's not always that you would give an infringement as well."
This was not the first time a police officer had played a role in making sure a baby was delivered safely, but Ms Grace said the situations were infrequent.
Last July a Waitemata constable Errol Diprose delivered a baby on Auckland's Southern Motorway.
The police officer posted his experience on the Waikato Road Policing Team's Facebook page last night with the hashtag #betterworkstories and within 24 hours it had been liked by 3,500 people.