San Francisco is considering a congestion pricing plan that would charge motorists for entering the busy downtown core -- but only if they make more than $46,000 per year. The San Francisco County Transportation Authority is leading the city’s study on the proposal to charge a fee to any drivers who enter the downtown zone, details of which were reported by the San Francisco Chronicle. London has used a similar congestion charge scheme for nearly a decade, but it does not include an income threshold. New York City is currently considering a daily charge of $14 for motorists who enter...