San Francisco Municipal Transportation Agency officials plan on capitalizing on the lack of parking spaces in San Francisco with the start of demand-based parking meters. Kicking off today, the idea goes something like this: Underground sensors will monitor the amount of cars cruising for spaces, said info gets sent to the meter, and the meter increases or decreases the hourly rate depending on the space's desirability. What's more, according to SFMTA Judson True, the new meters will also take credit cards. But you'll have to wait to swipe those cards since "the first demand-based parking meters should be operational in the spring." (KCBS)