Two guys rented electric scooters and drove them down a busy double road, police said.
The equipment is being tested in the Tees Valley area and can only be used on bicycle lanes and roads with a speed limit of up to 40 miles per hour.
Cleveland police said they stopped two teenagers who rented scooters and drove them along the A19 to Teesside Park on Thursday.
The police did not say how old he was or if he had a driving license.
Ginger, the company that carries out the process, was asked how the system will prevent those who are not authorized to use it from hiring vehicles, but did not comment.
"Not toys"
A force spokeswoman said neither boy wore any protective equipment, such as helmets or high-visibility clothing, as recommended by government guidelines.
Temporary Superintendent Graham Milne said, "Taking electric scooters may seem a little fun for some, but they're not toys."
According to the guidelines, 11.5 mph e-scooters can be driven on any road beyond the highway.
But a Cleveland police spokesman said he was not authorized on roads with a speed limit greater than 40 miles per hour.
In order to rent an e-scooter, a driver must have a temporary or full driving license.
Tees Valley Mayor Ben Houchen, who supported the pilot, said the riders' actions are "illegal" and a "flagrant violation of the rules", describing the couple as "idiots".
He said more than 500 runs have been made since the trial began on Monday, the "vast majority of which have been uneventful".
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