Instead, rather than making the date of October 26 a symbolic one, they have called for an open-ended campaign.
"Out of caution and respect for the interior ministry's warnings... We are asking women not to drive tomorrow and to change the initiative from an October 26 campaign to an open driving campaign," activist Najla al-Hariri told AFP today.
Several women said they had received telephone calls from the ministry, which openly warned yesterday of measures against activists who chose to participate, asking them to promise not to drive tomorrow.
On Wednesday, the ministry said it would crack down against anyone who attempts to "disturb public peace" by congregating or marching "under the pretext of an alleged day of female driving."
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In remarks to the Al-Hayat daily published today, Turki even warned against supporting the campaign online.
When asked what would happen to those who did, Turki said legal measures will be taken "against whoever violates the anti-cyber crimes law," an offence punishable by up to five years in prison in the kingdom.
A campaign website, where an online petition amassed more than 16,000 signatures before authorities blocked it two weeks later, was hacked today.
"Drop the leadership of Saudi women," read a cryptic message in English posted on the website, https://bsmedia.business-standard.comwww.Oct26driving.Com.
Referring to tomorrow, blogger Eman Nafjan said "the date was only symbolic, and women have begun driving before and will continue to drive after October 26."
Over the past two weeks, videos posted online have shown women already driving in Saudi Arabia.
In 1990, authorities stopped 47 women who got behind the wheel in a demonstration against the driving ban
In 2011, activist Manal al-Sharif, one of the organisers of this Saturday's campaign, was arrested and held nine days for posting online a video of herself behind the wheel.
That year Saudi police arrested a number of women who defied the driving ban and forced them to sign a pledge not to drive again.
Saudi women are forced to cover from head to toe and need permission from a male guardian to travel, work and marry.