Police are trying to find the "reckless" driver they say put people's lives in danger by riding round a busy roundabout in a go-kart.
The incident took place on Newport's Old Green roundabout on Tuesday morning and a go-kart was seized by Gwent Police later in the day.
Witness Darran Ward was on his way to work when he spotted the go-kart driving on the busy city centre road.
The 43-year-old shopkeeper said: "I'm quite a keen motorbike enthusiast so I went to get my phone out because it was an interesting noise."
Darran said he then saw two young people drive past in a go-kart.
"They were about 15 or 16. They were very low to the ground.
"They instinctively covered their faces as they drove past."
Sergeant Shane Draper said: “Gwent Police received a report regarding the use of a go-kart on a busy road. We have since been made aware of this video in circulation, believed to have been taken sometime this week on the Old Green Roundabout in Newport.
“The good news is that we have seized this go-kart but we are appealing for information on those who were using it.
“I’d encourage anyone that witnessed or witnesses this type of behaviour on the road to contact the police immediately.
“Not only is the driver putting their own lives at risk, they are also putting the lives at risk of other innocent, motorists using the road."
Sgt Draper added: “This is reckless behaviour of the driver – illegal driving on our roads will not be tolerated. There are a number of offences committed here, including: dangerous driving and driving with no insurance and we will be taking this seriously and we will be investigating.
“The consequences to this sort of behaviour could be devastating and I’m surprised that no one was injured."
Police are now appealing to anyone with information or anyone who may have dash-cam footage of the incident to call them on 101.
