A person who is obsessed with speed, often in the context of racing or extreme behaviors.

गति का दीवाना

English Usage: He was known as a speed freak among his friends due to his love for fast cars.

Hindi Usage: उसके दोस्तों के बीच उसे गति का दीवाना कहा जाता था क्योंकि उसे तेज़ कारों से बहुत प्यार था.