In this image made from video released by Change.org, a Saudi Arabian woman drives a car as part of a campaign to defy Saudi Arabia's ban on women driving, in Riyadh (Photo: AP)
Saudi Police detained two women drivers traveling with their families on the road connecting the capital Riyadh to the western city of Taef.
"A citizen tipped off police patrols that two women were driving cars with Omani licenses, Al-Hayat newspaper reported.
"The two women were detained and informed that women did not have the right to drive. They had to sign a commitment not to reoffend," it added.
Saudi Arabia in late June arrested five Saudi women for getting behind the wheel in defiance of a ban on female drivers in the ultra-conservative Muslim kingdom.
Their actions came in response to a call on the Internet for women in Riyadh to drive, after a show of defiance on 17 June in which 42 women took to the road.
Since then, "women defy the ban each day in different cities of the kingdom," an activist told AFP on condition of anonymity, noting her own mother had done so in Riyadh.
No law officially forbids women from driving in Saudi Arabia but a religious edict stipulates that women must be driven by a male chauffeur or family member.