noun
Legal and technical term for motorcycles with an engine displacement of 50cc or larger, as defined under Japanese vehicle classification. In everyday speech, バイク is more common.
自動二輪の免許を取るには教習所に通う必要がある。
To get a motorcycle license, you need to attend a driving school.
この駐車場は自動二輪専用です。
This parking lot is for motorcycles only.
Compound of 自動 (じどう, 'automatic') and 二輪 (にりん, 'two wheels'), literally 'automatic two-wheeler'.