why is it illegal to drive slowly in the bok farenheit 451?

Driving slowly is illegal because the people might be tempted to stop and enjoy the real world around them.

"I sometimes think drivers don't know what grass is, or flowers, because they never see them slowly," she said. "If you showed a driver a green blur, Oh yes! he'd say, that's grass! A pink blur? That's a rose-garden! White blurs are houses. Brown blurs are cows. My uncle drove slowly on a highway once. He drove forty miles an hour and they jailed him for two days. Isn't that funny, and sad, too?"