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accident costs accident experience advance direction signs analysis ANOVA areas areas/periods ARRB PROCEEDINGS Australian Road Research average behaviour blood alcohol blood alcohol concentration caffeine component comprehension conspicuity contrast countermeasure crashes detection diagrammatic signs disc distribution drink-driving drinking drivers drugs estimates evaluation experiment factors fatal accidents flashing formats frequency Hoffmann income increase intensified RBT intersection km/h legibility light luminance Maroondah Highway measures Melbourne modified stack night-time patrons pedestrian accidents pedestrian crossings performance poles police present pulse RBT operations red annulus reduction reported risk road accidents road loss Road Safety road user roundabout intersections SCAs scene seat belt seat belt legislation serious casualty accidents sign forms sign meaning signals significant stack signs statistically subjects symbolic signs Table target traffic control traffic signs tram stop turn restriction signs valuation variables vehicle Victoria visual visual angle weeks