Fig. 1From: Modelling travel time uncertainty in urban networks based on floating taxi dataLocation of the test sites. a Hietzing, b Westbahnhof, c Ring, d Südosttangente. In the subfigures the links are colored according to percentage of available (non missing) observations (using the ‘hot’ colormap of MATLAB; white=0%, orange = 50%, black = 100%). Source: reprinted from [1]Back to article page