She could see the underneath of the police car as it was supended 3m high in the air, but had driven past it before it landed.
"In the immediate moment there was actually nothing around him. The only people who would have swerved would have been people who were a bit starstruck by the incident really. No other cars were in danger really, just the police car that took off and went airborne.
"I'm amazed he's alive. He's a very blessed man."
The police car ended up on its roof and was badly damaged.
The officer was headed to a priority job at the time, police said in a statement.
"The sole officer driving the vehicle has minor injuries. There were no other vehicles involved."
The Serious Crash Unit attended the incident.
The crash closed two lanes for much of the morning, causing congestion past Highbrook Drive.
It was cleared just after 10am and congestion has now eased.