arrow blue bright direction indication one way only direction pointing pointing back sign traffic traffic flow traffic sign white black danger driving pictogram red road sign Road Warning Sign snow snow ahead snow sign snowing warning sign winter caution communication go highway intersection interstate light road stop street street scene streets traffic light visual visual communication yield walk black-on-white communicating directional gray grey law left-turn no-alternative only pointer reflective signs specific street-sign traffic-flow traffic-sign vehicles vehicular wording arrows divergent diverging splitting splitting-up turn turning two-way one-way one-way-signs care crossing informing pedestrians speed reduction street sign warning yellow bike circle city cycle cycling drive forbidden icon object ride shield urban