YOU SAID:
cars go fast on the road
INTO JAPANESE
車は道路で速く走る
BACK INTO ENGLISH
the car runs fast on the road
INTO JAPANESE
その車は道路を速く走っている
BACK INTO ENGLISH
the car is driving fast on the road
INTO JAPANESE
車は道路を速く走っている
BACK INTO ENGLISH
the car is driving fast on the road
Come on, you can do better than that.