Moshtaiyeen Ahmad participates in a rally at the Saudi Embassy on Tuesday.
Dressed in a pink shirt and armed with a bullhorn, Tigh Barry, a protester from San Francisco, easily attracts the attention of one motorist driving by when he shouts for them to pull over.
"You are driving. I don' think you noticed, but you are driving," Barry says through the bull horn.
Ali Al-Ahmed director of the Institute for Gulf Affairs of Washington, D.C., says Tuesday's protest is about protesting what he calls the "gender apartheid" in Saudi Arabia and it also coincides with a protest planned for Friday in the Kingdom itself.
"Women in Saudi Arabia who drive their cars are arrested, fired from their jobs and banned from travel," he says.