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That is because of the load of the Uber server. Also afaik (the api doesn't explain) it only shows available cabs, i'm currently seeing around 20 in London.

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"it only shows available cabs"; that indeed would explain the rather small amount of cabs and the difference in the # of cabs after refresh…

nice project btw. reminded me of the traintimes one http://traintimes.org.uk/map/tube/

and you might want to have a look at your auto-refresh feature as it keeps firing ajax requests regardless of the previous one being finished or not…

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