traffic sources wiki Original file (svg file, nominally 1,152 × 640 pixels, file size Originaldatei (svg-datei, basisgröße: 1.152 × 640 pixel Original file (svg file, nominally 1,600 × 1,120 pixels, file Traffic congestion occurs when a volume of traffic or modal split generates demand for space greater than the available road capacity; this point is commonly termed.