Traffic in Lisbon condensed in one day [mondeguinho.com] presents several visual experiments that map the routes of about 1,534 (taxi?) vehicles during 24 hours in Lisbon.
Watch the beautiful animations below.
See also 24 Hours of Traffic in the UK, 24 Hours of Air Flight Traffic, Britain from Above, Real Time Rome, Google Ridefinder and Cabspotting.
Via @aaronkoblin.