A teenager has been arrested for allegedly driving around in a fake emergency truck kitted out with more than $100,000 in sirens, lights and gear.

Victoria Police had been flooded with calls about the unmarked vehicle seen driving in a dangerous manner around Melbourne’s bayside area with red and blue lights flashing and sirens blaring.

Dashcam video captured by one motorist showed the truck zooming along a Melbourne highway as cars moved to the side, under the impression they were letting an emergency vehicle pass.

View photos Victoria Police have been flooded with calls about the vehicle. Source: 7 News More

View photos It's estimated the truck costs about $100,000. Source: 7 News More

The 16-year-old alleged driver from Brighton has been reported showing up at traffic accidents where he offered assistance to those involved in the crash.

It's been said he would arrive at the scene in the 4.5-tonne Isuzu truck wearing a hi-viz shirt.

View photos A police officer said he'd never seen anything like it. Source: 7 News More

It’s estimated the modifications to the light truck total somewhere near $100,000, with one police officer telling 7 News he had never seen anything like it.

"I've been in the heavy vehicle unit for five years now my sixth year I've never seen or had anything reported like this," the officer said.

The teen was arrested Tuesday afternoon and Caulfield police station, with a police spokesman saying the teen is yet to be charged.

One of the first things he allegedly told police was: "I think I've been doing something stupid."

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