Legal Position
The economy of operating such a small car (mostly in fuel and tires) has also often been helped by three-wheeled microcars or cars with very small engines being treated as motorcycles for tax and insurance purposes.
In some countries, microcars with a certain maximum weight are considered motorcycles and therefore no car driving licence is needed (Austria, France, Germany, Spain, Italy). This assures a certain market for elder people who do not want to or who cannot pass a car driving licence. More negatively, at least in Austria and France, such cars are sometimes derided as a solution for people who had their licence revoked because of drunk driving.
In some European countries, taxes formerly depended on engine displacement, and/or insurance rates depended on power. This has given rise to names of such cars as Citroën 2CV and Renault 4CV. This favourable treatment by governments is based on the benefits to a society of reducing use of such resources as minerals, parking space and foreign exchange, reduced noise and chemical pollution, reduced hazard to others (they are slow vehicles) etc. Reduced global warming from carbon dioxide emission has now been added to this list.
Another advantage is the ease of parking. Some microcars can be parked perpendicular, where other cars park parallel, or be lifted by hand, like a motor scooter, to get into a tight spot. The Isetta and some others had forward entry, to facilitate perpendicular parking close to other vehicles. The Myers Motors NmG (originally called the Corbin Sparrow) is licensed as a motorcycle and parked in motorcycle spaces in California, and probably in other places.
The small size improves handling by reducing the angular inertia. The Messerschmitt and Spatz have been described as much better than ordinary cars on snow and ice. Spare room on the road and ease of missing obstacles are also improved.
For the performance oriented, who prefer more than two wheels and a roof, the scaling laws show that one need not give up acceleration until the curb weight comes down to around the driver's weight, because power per weight of the car itself improves with small size, in an otherwise similar design. Top speed is lost with small scale, due to the decreased Reynolds number, but this is a small effect. The Messerschmitt TG500 had about a 78 mph (126 km/h) top speed with 15 kW (20 horsepower) and excellent aerodynamics.
In the UK before October 2000, a person who passed a motorcycle test was automatically granted a full sub-category B1 licence (lightweight car with an unladen weight of 550 kg or less, motor quadricycle, motor tricycle) as an additional entitlement with the full Category A (motorcycle) licence. Since 2000 a provisional car licence has to be requested.
The last major UK manufacturer, Reliant, ceased production of these vehicles in 1998.
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