"Under a pilot program being proposed by the San Francisco Municipal Transportation Agency, which oversees parking policies in The City, paid parking at meters in the Fisherman's Wharf, Marina, Civic Center, Mission, Embarcadero and downtown neighborhoods could be extended to four hours. The Fillmore district and the southern portion of The Embarcadero would have time restrictions abolished altogether. Currently, those neighborhoods have two-hour limits."
Sensors in the pavement would help determine the demand for each spot. Less popular spots would be cheaper, while areas in higher demand would have higher prices. Hourly rates would range from 25 cents to $6.