word usage - "Drove to the main road," or "drove off to the main road?"

After helping with the dishes, Eri swung her purse on her shoulder and
said goodbye to her mother, promising she'll come back to see her
soon. Keys in hand, her dad led Eri to the car, and then they drove
(off) to the main street.

Do I have to add off in that last sentence? I've seen examples like that before. When is neccesary and when not?

Answer

Drove to emphasises the destination. Drove off to emphasises the driving.