Car classification is hard to do since many vehicles fall into multiple categories or do not fit well into any. The following are the most commonly used classifications. Where applicable, the equivalent Euro NCAP classifications are shown. Car rental companies often use the ACRISS Car Classification Code. The United States Environmental Protection Agency (US EPA) has another set of classification rules based on interior passenge and cargo volumes. A similar set of classes is used by the Canadian EPA.In Australia, the Federal Chamber of Automotive Industries publishes its own classifications.