Thought this might be of interest, an interactive map showing DC Parking violations over the month of May 2016. This was the most recent month of data published by DC Open Data.
There are three layers that can be activated via the layer selector in the top right a corner. Density, Time Animation(Showing violations is aggregated into a 24hr period), and violations catorgorized by State Tags.
For reference there were ~126,000 violations for this dataset.