The OECD has defined a motorway as: Motorways are identical to freeways as a road type, and comparable to the United States's Interstate Highways as a classification. In English-speaking countries the term is used in the United Kingdom, some parts of Australia, New Zealand, Pakistan, some other Commonwealth nations, and Ireland (a motorway is also called a mótarbhealach (plural: mótarbhealaí'') in Irish). In Ireland, a road built to motorway standard, but without the designation (and the regulations and traffic restrictions resulting from that designation), is known as a High-quality dual carriageway.

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