Truck driver charged over serious Dee Why crash

A 40-year-old man has been charged over last month's horror crash in Dee Why, on Sydney's northern beaches.

The truck was pictured travelling down Warringah Road at about 6am on October 21.

Police allege the truck lost control as it turned left into Pittwater Road, crossed over three northbound lanes and mounted the median strip.

The truck then allegedly entered the southbound lanes before ploughing into several cars waiting at the lights.

CCTV taken at a different angle shows the truck flip onto its side and slide across the road, bringing several vehicles with it.

A young woman, a police officer from the Central Metro Region Command, was trapped in the wreckage for more than an hour and was left with serious injuries.

The ten-tonne truck crushed the car she was in with another police officer, who was treated for minor injuries.

In total five people were injured in the crash.

The man was charged with two counts of dangerous driving causing grievous bodily harm, negligent driving and causing bodily harm by misconduct.

A Smithfield man will front court in January.