Police are investigating after Auckland motorists spotted a driver barrelling onto an Auckland motorway with a ladder sticking out the window.

An out-of-towner reported spotting the car around 10.30am today at the lights on Ocean View Rd, on Auckland's North Shore.

The car had a ladder sticking out of the right-hand back window, jutting at least a metre out into the road.

Senior Sergeant James Bothamley confirmed police were aware of the incident and were making inquiries.

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"It looks completely unsafe and this could have ended badly," he said.

"All loads need to be secured, and the way anything is carried on or in a vehicle should not endanger other motorists and people."

Bothamley said the scenario at hand could have posed a risk to other road users, not to mention the driver and any passengers in the event of a crash.

The motorist who noticed the car's unusual cargo also said he watched the driver careen through a red light onto the motorway. Photo / Supplied
The motorist who noticed the car's unusual cargo also said he watched the driver careen through a red light onto the motorway. Photo / Supplied

The bemused driver who spotted the somewhat oversized cargo said "much to our horror and amusement they headed onto the motorway".

The person also claimed the car careened through a red light en route on to the Northern Motorway.

Sergeant Bothamley said the driver could be liable for a $600 fine for the unsafe loading of a vehicle.