Rallycross is a form of sprint style automobile racing, held on a closed mixed-surface racing circuit, with modified production or specially built road cars, similar to the World Rally Cars, although usually with about stronger engines, due to eg. their 45mm turbo restrictors. It is mainly popular in the Nordic countries, the Netherlands, Belgium, France and Great Britain. An inexpensive, entry level type of rallycross is the Swedish folkrace or its Norwegian counterpart, the so-called bilcross. Rallycross can also be referred in Europe as 1:8 scale off-road radio-controlled buggy racing.