スピード狂きょう

noun

speed maniac; speed demon

Refers to a person obsessed with driving or moving at high speed; often used for reckless drivers or thrill-seekers.

• 彼かれはスピード狂きょうで、いつも制せい限げん速そく度どを守まもらない。

  He's a speed demon and never follows the speed limit.