Michael Yuan wanted to pop the question to his long term girlfriend Katie Stellon. The Adelaide resident decided what better way to do it than enlist the help of the boys in blue.
Video footage, shot on police body cameras and mobile phones, has emerged of the elaborate proposal after it was posted to social media.
The video shows Constable Michael Plunkett and John Henderson, pulling the couple over in the suburb of Norwood in the early afternoon, as part of Michael's secret plan to propose to his girlfriend.
The officers told a "shocked" Michael why they pulled him over.
"Just letting you know the reason why we stopped you mate is because when we ran your registration, it just came up with a suspect flag on the car," said one officer.
The couple obligingly get out of the car while the police run some fake checks on the car.
A police officer asks Katie her name and relationship to the driver and she responds: "Boyfriend."
To which the officer replies: "Look, he's not going to be in too much trouble; well he could be in a bit of a lifetime of trouble, really."
Katie then has her attention turned to Michael who is down on one knee holding a ring box. And he asks her to marry him.
After a few moments a shocked Katie responds: "Yes of course".
Michael told The Advertiser that he took several weeks to plan the perfect proposal.
"An American person did (it) and I saw it on Instagram and I had it at the back of my head," he said.
"I floated the idea with one of my nurses (Caitlin Plunkett) and it turns out her brother is a police officer."
It only took a quick phone call, and the police officers were onboard after getting permission from the SA Police management.
Michael believes the planning that went into it will make a very good story to tell future generations.
"Initially (she was in) lots of shock but afterwards she was just trying to figure out how I did it all because I'm not very organised," he said.
"It's a good story to tell our children.
"The boys did so much work. I can't thank SAPOL enough."
Katie had no idea Michael was planning to propose and said she was genuinely shocked.
"I was quite confused ... I turned around and there he was, it was very, very special," she said.
"I didn't think he would go to that extent and that's why it was such a shock."
The happy couple are planning a December wedding in Adelaide.