Think the Smart Car is small? I have run across a couple 'microcars' here which in Finnish are called mopoauto. A mopo in Finnish is a moped, just to give you an idea of what type of car it is. As you can see, there is an orange triangle on the back because these 'cars' are limited to a max speed of 45 kilometers an hour. (Just under 30 miles an hour)
Why would someone have such a car, especially since they cost more than other cars? Well, you can drive one as young as 15 years old. You also don't need a regular driver's license in order to drive one. So older people buy these as much as young ones, if not more.
I think your crazy to take one of these things on a Finnish road, other than in one of the cities, but apparently they do. At least due to the speed restrictions, they are kept off the few Finnish highways.