http://www.newyorker.com/fact/content/?031013fa_fact
Suicide, and the Golden Gate Bridge. “Several people have crossed the Bay Bridge to jump from the Golden Gate; there is no record of anyone traversing the Golden Gate to leap from its unlovely sister bridge.”
(The four-foot rail. The article doesn’t mention it, but there are also signs on the bridge giving a number to call if you “need help,” or similar.)