On November 5, 2018, an out-of-control truck thundered down the M1 Princes Motorway and old Mt Ousley Road - careering across the Princes Highway intersection and into the McDonald's car park and Fairy Meadow.

Several cars were pushed aside by the truck, with a white SUV ending up jammed up against the apartment block behind the restaurant.

Roads and Maritime Services later assessed the truck involved in the crash and issued two major defect notices, one for faulty brakes on the rear axle.

After the crash Roads and Maritime Services announced it was assessing the accident to see if there were added safety measures that could be introduced.

"This review will help inform any future plans for improvements to the road network at this location," a Roads and Maritime Services spokesman said.

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As of this month, that study still had not been completed.

"Roads and Maritime Services assisted NSW Police with the investigation into an incident on November 5, 2018 at the intersection of the Princes Highway and Mt Ousley Road," the spokesman said.

"Roads and Maritime Services has commenced an internal review of the incident and is reviewing road safety on Mt Ousley, along Old Mt Ousley Road and the roundabout with the Princes Highway."

However, the review is for Roads and Maritime Services' use only and will not be seen by the public.

"The review being carried out is internal and will not be published or available publicly," the spokesman said.

A review is only the first step in deciding what measures can be carried out.

After the review occurs, it does not mean that every safety measure included in the report will be introduced.

Roads and Maritime Services will then have to try and secure funding for the works before any improvements can be made.

The Princes Highway-Old Mt Ousley Road has a long history of accidents.

As far back as 1946 trucks losing their brakes have ended up shooting across the highway and into what was, back then, a vacant paddock.