Najla Hariri was arrested while driving to the office of her daughter, Dalia.
"My mother was taken to the police station," the daughter said.
Since mid-May, Hariri who campaigns for women's rights, has driven around Jeddah several times without being arrested.
She is among a group of activists who launched an Internet campaign on June 17 urging women to defy the ban on driving in the ultra-conservative kingdom.
Since then, women regularly get behind the wheels of their cars, according to the activists.
The icon of the campaign, Manal al-Sherif, a 32-year-old computer security consultant, was arrested on May 22 and detained for 10 days after posting on YouTube a video of herself driving her car around the eastern city of Khobar.
Five Saudi women were arrested at the wheels of their cars in late June in Jeddah.
Women in the kingdom who have the means hire drivers while others must depend on the goodwill of male relatives.
They are also obliged to be veiled in public, and cannot travel without their husbands or a close male relative.Saudi Arabia is the only country in the world where women are not allowed to drive.
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