Two wheeled cars: not motorcycles
Yes, it is possible. Just because it has two wheels doesn’t make it a motorcycle or a scooter. Back in the days that the cars and motorcycle were still in infancy, cars were being produced that had only two wheels.
They didn’t look like motorcycles, they looked like cars. The two wheel cars did have four wheels, but two were used to stabilize the car at low speeds or when it was stopped. Once it reached gyroscopic speed, the two side wheels were retracted.
Notable in this design was the French Monotrace. It was built during the 1925 to 1928.
The engine was a single cylinder 510cc engine.
It looks like it came straight out of a Donald Duck cartoon.
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Another one built in 1912 was the enormous Scripps-Booth Bi-Autogo, with a V8 engine and weighing 3500 pounds! Even the Honda Goldwing does not weigh that much!
Several other two wheel cars exist, but not many were made in large numbers. All date back to the days that there were as many manufacturers as there were bicycle manufacturers. Eventually, things got more clear, and the demarcation line between cars and motorcycles got defined.