An Amsterdam court today rejected the last challenge to the upcoming “Auto-Free Sunday,” clearing the way for a one-day ban on vehicles in the downtown area this weekend. The group Environmental Defense is spearheading the ban to call attention to pollution and congestion and convince people to give public transportation a try. Efforts are also under way to ban cars from Rotterdam and other Dutch cities this Sunday. Other European cities have held similar car-free days to pull people out of their vehicles.