Later on, microcars are pretty much scooters or bikes with cabs. These days, some ultra-lightweight sports cars such as Polaris Slingshot may be registered as motorcycles due to having practically no safety features expected from a car (in the US, there's also an ‘autocycle’ option for three-wheeled vehicles).
> A cyclecar was a type of small, lightweight and inexpensive car [..] The purpose of cyclecars was to fill a gap in the market between the motorcycle and the car.
These were motorized cars, but just small versions, as far as I can understand. The velomobiel is entirely human powered.
It was also featured as Sam Lowry's car in ‘Brazil’: https://youtube.com/watch?v=iTYUPuZGbes