A three-year-old boy was rushed to hospital after he was hit by a car in Sydney's west.

Emergency services responded to reports that the toddler was struck by a car on Greenbank Drive in Blacktown just before 12pm today.

NSW Ambulance paramedics called for a CareFlight helicopter, which dispatched a specialist doctor to the scene to provide an intensive level of treatment for the child.

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The CareFlight helicopter arrived at the scene within five minutes of being dispatched, a CareFlight spokesperson said.

The specialist doctor and the helicopter's quick intervention "may well have saved the child's life," the spokesperson said.

The boy was then driven to Westmead Children's Hospital with the specialist doctor on board.

The toddler is now in a stable condition with non-life-threatening injuries.

Police established a crime scene and the car, a Honda Accord, was seized for mechanical examination.

The 22-year-old male driver was taken to hospital for mandatory testing.

Investigations into the incident are ongoing.

Two men have been charged over their roles in an alleged road rage incident in Sydney's west earlier this year.

A 25-year-old man was driving on Yerrick Road in Lakemba when a Toyota Corolla reversed from a driveway, allegedly cutting him off in traffic around 5pm on April 5.

Later the driver of the Toyota allegedly cut the other man off in traffic again, stopped his car in the road and pulled out a knife.

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Video from the incident filmed by the alleged victim's passenger showed a man wearing a black hoodie or raincoat getting out of the Toyota.

Police said the man rushed up to the window of the other car, which drove away allegedly hitting the Toyota.

Police said the Toyota then followed the other car through surrounding streets.

After weeks of investigation, police arrested a 27-year-old man at a home in Granville this morning.

He was charged with a string of driving offences, including knowingly driving in a menacing manner, driving recklessly and furiously, and using an offensive weapon with intent to commit an indictable offence.

The 27-year-old was refused bail and will appear at Parramatta Local Court tomorrow.

The 32-year-man who allegedly owned the Toyota was arrested several days ago at Campsie Police station on Thursday, June 6.

It's believed he was not in the car at the time but was charged with unlicensed car dealing and not disclosing the identity of the car's driver.

He was granted bail and will appear before Bankstown Local Court next month.

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A woman, 82, has been arrested after a mother pushing a pram was allegedly struck by a car in hit and run in Sydney's southwest.

Police were called to Claremont Street in Merrylands about 1.40pm yesterday after a blue Mitsubishi Lancer struck a woman as she was crossing the road.

CCTV shows the car driving away.

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The woman in her 40s was found injured on the side of the road before being taken to hospital in an ambulance with a broken leg.

The woman's two-year-old daughter in the pram was unharmed.

Today police confirmed they seized the unregistered Lancer from a home on Guildford Road at Guildford.

"Police arrested an 82-year-old woman at the scene and took her to Granville Police Station," NSW Police said in a statement.

"She has since been released without charge, pending further inquiries."

Five men have been arrested after police allege their car was travelling at 150km/h, sparking a chase through Melbourne's northern suburbs.

Police spotted a white Toyota Camry allegedly "driving at high speeds" on Paisley Street in Footscray on Friday about 11.40pm.

"With assistance from the Air Wing, the Toyota was alleged to have been observed travelling at speeds of 150km/h throughout Footscray, Derrimut, Sunshine, Moonee Ponds and Brunswick," Victoria Police said in a statement.

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Police deployed "stop sticks" on Sydney Road, stopping the car on the overpass above the Tullamarine Freeway in Parkville just after midnight.

"All five occupants inside the vehicle were swiftly arrested and are currently assisting police with their enquiries," police said.

Police do not believe the Camry was stolen.