RIYADH (AFP) - A number of Saudi women drove cars on Friday in response to calls for nationwide action to break a traditional ban, unique to the ultra-conservative kingdom, according to reports on social networks. The call to defy the ban that spread through Facebook and Twitter is the largest en-masse action since November 1990 when a group of 47 Saudi women were arrested and severely punished after demonstrating in cars. Weve just returned from the supermarket. My wife decided to start the day by driving to the store and back, said columnist Tawfiq Alsaif on his Twitter page. I took King Fahd Road (Riyadh artery) and then Olaya Street, along with my husband, I decided that the car for today is mine, Maha al-Qahtani tweeted.