Thanks - Cesium can handle a lot of building geometry quite nicely actually. Great platform for this type of city visualization work. That video clip reminded me of this visualization: https://www.dropbox.com/s/6wjjz254jcnwcq4/FLOWBITS_DEMO.mp4?dl=0
Divvy bikes currently do not have GPS tracking for exact routing. When a customer checks out and checks in a bike to a station, they record a flag, and they make these flags available. Each data point has station id and timestamp of checkout, trip duration, type and age of rider if registered among a few other things.
Would be cool if they were all GPS enabled though... could probably infer a most probable route by looking at trip duration and comparing to known routes.