A Sydney man has been fined just $71 after he was spotted riding a push scooter through one of the city’s busiest road tunnels.

The man was filmed as he pushed himself along the Cross City Tunnel westbound at around 3.30pm yesterday, seemingly oblivious to the traffic around him.

Video filmed by a stunned passenger captured the man, dressed in a white shirt and dress shoes, as he calmly rode the scooter in the far left lane.

As concerned drivers slowed behind him, Transurban staff activated a warning system and urged the man over a PA to stop and wait for assistance.

By the time crews arrived, he had left the area.

A stunned passenger filmed the man as he rode through the tunnel. (Supplied)

The tunnel's operators Transurban sounded an alarm and urged the man to pull over. (Supplied)

The man fled before he could be stopped by authorities. (Supplied)

After video of the incident was widely circulated on social media and television news broadcasts, a 42-year-old man from Crows Nest handed himself into the Surry Hills police station.

He was issued with a penalty notice for “using a wheeled device on one-way road more than one marked lane”.

The notice carries a fixed fine of $71.

NSW Police Acting Assistant Commissioner Stuart Smith said the man’s actions had the potential to cause serious harm to both himself and law-abiding drivers.

“The incident highlights the profound impact on the road network that one person [can have], and the interest generated by this matter shows that the public share that view,” Acting Assistant Commissioner Smith said.