Constable Anthony Woods, 28, was run over in June by a man allegedly attempting to avoid arrest.
About 2000 officers, dignitaries and loved ones on Thursday attended a police funeral at Perth's Optus Stadium, where mourners stood in silence as a bagpiper led the procession into the room.
Const Woods had just passed his probation before he was killed, having been accepted into the police cadets program in 2019.
His wife Emily described the "happy tears" they cried at the supermarket when he received a phone call confirming the news.
"We knew that this was what he was meant to do," she told the service.
"Anthony was a great protector. He wanted to protect and support everyone but he especially played that role for me."
Ms Woods wept as she spoke about the life she built with the "ridiculously fun" and no-frills young man, who had his mother's name tattooed on his arm and was happiest spending a night on the couch with his spouse.
"Anth, I'm so proud of you and I'm so grateful for you," she said.
"Because your love made me really strong and I'll carry that with me every minute of every day."
Senior politicians and officers were among the guests, including Opposition Leader Peter Dutton, WA Police Commissioner Col Blanch and Premier Roger Cook.
Prime Minister Anthony Albanese, who paid tribute to Const Woods as a "young man cruelly robbed of his future", was represented by local Labor MP Zaneta Mascarenhas.
The constable's mother, Natalie, told the service of an extroverted little boy who slept with his football boots on and his cricket bat in his bed.
"You will never be forgotten my darling boy," she said.
"You will always be in our memories and in our broken hearts."
Older brother Nathan also paid an emotional tribute, promising to live life to the fullest in his sibling's honour.
Flags flew at half-mast at police stations across the state after the death and the fallen officer was honoured in federal parliament as someone who exemplified the values of the force.
Police chaplain Paul Trimble spoke of a man who Const Woods had previously arrested leaving a condolence card at the station when he attended to sign in for his bail conditions.
A "firm but fair" officer and a gentleman, he died doing what he loved best.
"Anthony was in his element and wouldn't have wanted to be anywhere else in that moment," Mr Trimble said.
The service concluded with the police commissioner handing a folded flag to Ms Woods after saluting the coffin.
Officers then formed a guard of honour stretching about 800 metres as the hearse departed.
Mr Blanch made a state-wide police radio broadcast, including a minute's silence, with on-duty officers encouraged to exit their vehicles if possible to pay their respects.
About 100 members of the public gathered in gloomy weather to watch a live-stream of proceedings outside the stadium.
Mr Albanese said all Australians joined the officer's family in mourning.
"He was a young man cruelly robbed of his future ... an Australian who went to work and never came home," he said.
Yagan Square, Elizabeth Quay and His Majesty's Theatre were among dozens of landmarks lit blue on Thursday in the officer's honour.
Reagan Ainsley Chown, 23, has been charged with murder after a vehicle with stolen number plates he was allegedly driving hit and dragged Const Woods underneath.
Chown is next scheduled to appear in court on August 30.
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