I have been working with the data material Plymouth365.
Different approaches have now been tested and it looks promising that this could lead to something.
I have been focusing on the analysis of the data in the context of a 24h day. Basically what I did is squeezed in all the days into one sample day and plot it. In other words, all the days are superimposed onto one day.
Image by urbanTick - activity graph
(These are screenshot movies and shows Google Earth playing the tracks over 24hours. It is a first shot at it, so needs some cleaning and tweaking.)
Image by urbanTick - aquarium, Time space diagram referred to as the aquarium. After Kwan (2004)
This data is actually pretty new, these are the new London tracks from October and November in 2008)