charging bikes?

While in my environmental science class today, we went to the golden gate bridge to monitor traffic. We counted how many cars carried multiple people, single people, mass transit, motorcycles, semi trucks, bicyclists, and walkers in a six minute period. We got an average of 78 people driving alone and only 20 people carpooling. There were 6 people bicycling. I would've thought that number would be higher. I appreciate them though; the people who bike to where they're going. While discussing these stats with my teacher, she mentioned that the Golden Gate Bridge was going to start charging bicyclists to go across the bridge. Insanity! It's hard enough to get a car that runs on bio-diesel or vegetable oil, but if you start charging to bike on the bridge, well what's left? Is walking next on their list? Unfortunately, bicycling numbers will probably go way down after they start charging, and driving numbers up. San Francisco has such beautiful paths to walk or bike on and incredibly great public transportation. Why don't more people take advantage of all of it? I honestly hope they change their mind on charging bicyclists, but if they don't, they should at least give discounts to people with low emission cars.