In less than 24 hours three men and one child were killed with counselling services now being offered to emergency services who attended.

A crash just before 6pm on Friday at Ballimore east of Dubbo left a 35-year-old man dead and a six-year-old girl injured when a Toyota LandCruiser and truck collided.

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At 3.20pm on Saturday a 14-year-old boy from Menah and 25-year-old man from Gulgong were killed when the car they were in left the road and hit a tree near Mendooran. The incident left three passengers in the car with fractures.

Then at 3.45pm a 72-year-old man was killed when the Honda Civic he was driving on Henry Parkes Way east of Manildra crashed into a tree.

NSW Police Acting Inspector Kelly Wixx said while each crash was being investigated, the crash investigation unit has been called in for the Mendooran incident.

"They look at environmental factors like weather and any mechanical issues, car speed and conduct a forensic analysis of the incident," she said.

The car involved was a silver colour 2005 model Mitsubishi 380 sedan.

"A number of witness have been contacted and we call on anyone that saw the car prior to the crash to contact Crime Stoppers on 1800 333 000," Acting Inspector Wixx said.

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The horrific scenes at the crashes have prompted support services to be offered to emergency services personnel who attended.

"We do have support services in place to assist our staff if they're effected by things they see and that has been made available to all the officers who attended," Acting Insp Wixx said.

"Unless you've experienced it first-hand some people don't understand the gravity and the consequences that can occur."

Acting Insp Wixx said it only takes a couple of seconds for something to go very wrong when driving at highway speeds.

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"If you're travelling at 100km/h it can happen in seconds, if you look down at your phone and then you drift across to the other side of the road," she said.

These latest deaths bring the road toll up to 27 people across Western NSW roads so far this year. This number is down on the 35 deaths to the same period last year.

With school holidays continuing Acting Insp Wixx urged people to drive to the conditions and remain attentive while behind the wheel.

"The flow on effect from these kinds of incidents can last for years," she said.

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