Experimenting with mapping a data set with Leaflet, D3 and Canvas. I used the San Francisco Parking Meters data set. Colors represent the type of meters.

One cool thing I noticed, when I was starting to play with the data...I noticed that the black dots were clustered more closely than all the others. Why? 

Turns out, those are motorcycle parking meters. 

Code is available here: http://bl.ocks.org/kristin-henry-sf/2ffa2a4d06412db552f627b48b85cf97