Fig. 6From: Travel time predictions: should one model speeds or travel times?Average mean error (ME) and mean percentage error (MPE) for the validation sample averaged over links. a ME, b MPE. Hietzing (blue), Westbahnhof (black, dotted), Ring (red, dashed), Südosttangente (green, dash-dotted). Results for the indirect method in bold, results for the direct method in normal line widthBack to article page