San Francisco is testing out a wireless network that will tell motorists where available parking spots are located. Small sensors detect if the parking space is empty or occupied, and sends the information to either street signs or to your mobile phone. Based on your location, the system will show you a map of nearby free spaces. The goal is to cut down or eliminate cars cruising around searching for a spot. It's a good thing too. Two studies in New York and Los Angeles have shown that all that searching is creating lots of unnecessary traffic and wasted fuel.

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