Parents warned to look out for their kids this summer due to threat of ...

With summer on the way, parents are being warned to make sure their children aren't being left in locked cars as an increasing number of calls are made to ambulances.

On a typical Australian summer day, the temperature inside a parked car can reach as much as 30 to 40 degrees hotter than outside.

Each year emergency services rescue more than 2,000 unattended children in cars, but with the rise of self-locking doors, experts warn this figure could increase.

With summer on the way, parents are being warned to make sure their children aren't being left in locked cars as an increasing number of calls are made to ambulances

With summer on the way, parents are being warned to make sure their children aren't being left in locked cars as an increasing number of calls are made to ambulances

75 per cent of the temperature increase occurs within five minutes of closing the car

75 per cent of the temperature increase occurs within five minutes of closing the car

In some instances, distressed parents have been trapped outside their vehicles after the car doors have locked without warning as they left the keys inside. 

On a 30C day the temperature inside a car can reach up to 70C in under an hour, according to Kidsafe NSW.

The majority of the temperature increase occurs within five minutes of closing the car. 

One terrifying incident in January saw a child left in a hot, locked car for three hours on Sydney's north shore.

Police were forced to smash in the window of the car to rescue the toddler who was found dehydrated and visibly distressed.

Richard Ligault, the boy's father, said he had a 'rough night' the night before and simply forgot about his three-year-old son.

One terrifying incident in January saw a child left in a hot, locked car for three hours on Sydney's north shore (pictured, the car the toddler was left in after police rescued him)

One terrifying incident in January saw a child left in a hot, locked car for three hours on Sydney's north shore (pictured, the car the toddler was left in after police rescued him)

'I went to drop off my kid at the school, he fell asleep in the car ... I went straight to work,' Mr Ligault told media. 

In another dramatic case caught by Channel 9's show Paramedics, the RACV, police, ambulance officers and firefighters were called to rescue two-year-old Charlotte from a

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