In the UK, the distinction between a tramway and a railway is precise and defined in law. In Canada and the US, such street railways are referred to as trolleys or streetcars. The key physical difference between a railroad and a trolley system is that the latter runs primarily on public streets, whereas trains have a right-of-way separated from the public streets. Often the US-style interurban and modern light rail are confused with a trolley system, as they too may run on the street for short or medium-length sections. In some languages, in particular Dutch, the word "tram" also refers to interurban and light rail-style networks.