Move is expected to boost women's employment and add $90 billion to economic output by 2030
Saudi Arabia will allow women to drive from Sunday, ending the world's only ban on female motorists, a historic reform marred by what rights groups call an expanding crackdown on activists.
Overturning the decades-long ban, a glaring symbol of repression against women, is part of Crown Prince Mohammed bin Salman's much-trumpeted reform drive to modernise the conservative petrostate.
Potentially thousands of female drivers are set to take the wheel on Sunday, a long-awaited rite of passage for women in the kingdom that many say could usher in a new era of social mobility.
"It is a very important step and essential for women's free mobility," Hana al-Khamri, author of the forthcoming book "Female Journalists in Gender Apartheid Saudi Arabia", told AFP.
"Women in Saudi Arabia live under patriarchal structures. Allowing them to sit behind the wheel will help challenge social and gender norms that hinder mobility, autonomy and independence."
For many women the move should prove transformative, freeing them from their dependence on private chauffeurs or male relatives and resulting in big family savings.
"It's a relief," Najah al-Otaibi, a senior analyst at pro-Saudi think-tank Arabia Foundation, told AFP.
"Saudi women feel a sense of justice. They have long been denied a basic human right which has kept them confined and dependent on men, making it impossible to exercise a normal life."
The kingdom earlier this month began issuing its first driving licences to women in decades, with some swapping their foreign permits for Saudi ones after undergoing a practical test.
Some three million women in Saudi Arabia could receive licences and actively begin driving by 2020, according to consultancy firm PricewaterhouseCoopers.
A handful of female driving schools have cropped up in cities like Riyadh and Jeddah, training women to drive cars and also Harley Davidson motorbikes - scenes that were unimaginable even a year ago.
Many Saudi women have ebulliently declared plans on social media to drive their mothers for coffee or ice cream as soon as the ban ends on Sunday, a mundane experience elsewhere in the world but a dazzling novelty in the desert kingdom.
For decades, hardliners cited austere Islamic interpretations to justify the driving ban, with some asserting that women lack the intelligence to drive and that lifting the prohibition would promote promiscuity.
The decision to lift the ban was catalysed in large measure by what experts characterise as economic pain in the kingdom owing to a protracted oil slump.
The move is expected to boost women's employment, and according to a Bloomberg estimate, add $90 billion to economic output by 2030.
Many women fear they are still easy prey for conservatives in a nation where male "guardians" - their fathers, husbands or other relatives - can exercise arbitrary authority to make decisions on their behalf.
The government has pre-emptively addressed concerns of abuse by outlawing sexual harassment, with a prison term of up to five years and a maximum penalty of 300,000 riyals ($80,000).
Prince Mohammed, appointed heir to the most powerful throne in the Middle East a year ago this month, has also lifted a ban on cinemas and mixed-gender concerts, following his public vow to return the kingdom to moderate Islam.
But much of the initial optimism over his reforms appears to have been dented by a sweeping crackdown on women activists who long opposed the driving ban.
Authorities have said that nine of 17 arrested people remain in prison, accused of undermining the kingdom's security and aiding enemies of the state.
The detainees include three generations of activists, among them 28-year-old Loujain al-Hathloul, also held in 2014 for more than 70 days for attempting to drive from neighbouring UAE to Saudi Arabia, and Aziza al-Yousef, a retired professor at Riyadh's King Saud University.
State-backed newspapers have published front-page pictures of some of the activists, the word "traitor" stamped across them in red.
Human Rights Watch this week said the kingdom has arrested two more women activists - Nouf Abdelaziz and Mayaa al-Zahrani.
"I am not a provoker, not a vandaliser, not a terrorist, a criminal or a traitor," Abdelaziz said in a letter before her arrest, which was cited by HRW.
"I have never been (anything) but a good citizen who loves her country and wishes for it nothing but the best."
Both women are being held incommunicado, HRW said.
Saudi authorities did not respond to requests for comment.
Even some of the prince's ardent supporters have labelled the crackdown a "mistake".
It has been seen as a calculated move both to placate clerics incensed by his modernisation drive and also to send a clear signal to activists that he alone is the arbiter of change.
But many Saudi women nevertheless credit decades of fearless activism for the end of the driving ban.
"These activists should be credited for this historical change, not jailed," Khamri, who is currently based in Sweden, said.
"It is sad that these women who have been fighting for the right to drive won't be there to witness this historic moment."