In order to lessen the impact and to not appear to be directly challenging the authority of the Saudi King, only women who had valid driver's licences from other countries took part in the protest... they wanted to ensure people knew that this was in no way a revolution and that it would not turn into a revolution. Some drove to the store, some to work, others just for a ride to be seen. The organizers claim that they are simply looking for a normal way of life, and that this law and several others are unnecessarily restrictive of women.
The protest led to some supporters of the ban to respond. One prominent sheik named Mohammed al-Nujaimi said that women driving put Saudi society in great danger claiming it would ruin marriages, cause low birth rates, spread adultery, and cause more car accidents. He claimed that the educated have decided to ban women from driving because of the political, religious, and economic problems it would create.
Not all men in Saudi Arabia agree with this law however... Comedian and social activist Hisham Fageeh released a four minute video entitled, "No Woman, No Drive." A spoof on the Bob Marley classic.