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jtchang
on Dec 23, 2012
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Ten-year-old invents light-up crosswalks, IBM make...
I believe outside San francisco city hall we have a crosswalk which lights up. I believe it with with LEDs that flash. I like this on way better.
Does it turn off immediately when there is no one in the crosswalk?
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Does it turn off immediately when there is no one in the crosswalk?