There is a one-block stretch of Napoli Drive above Sunset that is perfectly sloped for reaching dangerous speeds. The only drawback is that missing the turn puts you in the middle of a busy 4-lane boulevard. So you didn't miss the turn, or you went to Plan B: driving or jumping into the ivy. It wasn't painless, but we knew from experience there were no sprinklers buried in the vines so it was "safe." You definitely didn't want to get trapped inside the car with your feet on the pedals. Ralph Nader would not have approved.
Johnny was a terrible driver. Catastrophically bad. Half the time he'd end up on the sidewalk, plowing through pedestrians like so many clown punching bags. And if he hit one, he'd back up and blow a raspberry over his victim. No respect. Fortunately he soon channeled his aggressions in another direction, something about Mrs. Bates and a shower curtain.