As you might expect, the photo is a mix of planning and luck
While the scene in itself is pretty much as I planned it, the taxi in the photo is quite random. The Rosenthaler Platz in the centre of Berlin is a very busy traffic hub connecting 5 or 6 streets and some tram rails.
First my plan was to enlighten the crossing with light trails, when suddenly the taxi had to stop for a full exposure (6 seconds). So I decided to build the photo around the taxi and then added trails from other exposures.
Camera: Canon EOS 500D
Lens: Canon EF-S 10-22mm @ 17mm
Exposures: 3 (-2, 0, +2)
Exposure time (middle): 6s
Tripod: Manfrotto 190CXPRO4
Location: Directly on edge of the pavement at Rosenthaler Platz
Software: Lightroom 4.3, Photoshop CS6, Photomatix Pro