Residents have reported the man often seen in the area around Debenhams in Torquay, Devon, from around midnight onwards, charging drinkers for a ride between pubs or for a lift home.
His enterprising antics have caused anger among the locals, with one cabbie accusing him of flouting rules by not having a licence, insurance or a safe vehicle.
One taxi driver – who wished to remain anonymous – said he had seen “about five people hanging off the side” at times.
“You see it zooming around the harbour area and Debenhams, charging around with flashing lights on – it has to be seen to be believed,” the fuming cab driver told Devon Live.
“I saw about five people hanging off the side of it once. It is only supposed to take one person.
“I think he has put a mattress on it and he goes around from pub to pub picking up people and dropping them off. He charges for it too.
“He’s been doing it for a couple of months now. You see people jumping on it and hanging off the side. It’s incredible.
“It goes around 20mph and I bet he doesn’t have a licence. It is totally illegal.”
People outside London must apply to their local council for a licence to drive a taxi or private hire vehicle.
They must be able to work legally in the UK, and have held a full GB or Northern Ireland driving licence – or a full EU driving licence – for at least a year.
Wannabe cabbies must also be a “fit and proper person” – which means their background and character will be checked.
The council may carry out an enhanced criminal records check, while applicants may also need a medical examination, a “knowledge” test and even another a driving test.
“I know it sounds sad me saying all of this but it is only a matter of time before someone falls off or gets hurt,” continued the angry local taxi driver.
“He is not a taxi but he has a taxi sign on it, I don’t think he has a licence and i’ll be he doesn’t have insurance either.
“We have to pay for licensing and things like that. Complaints have been made by other drivers but nobody has done anything about it.
“If they’re not going to do anything then I might as well get one myself!”