black black on white direction law no alternative one way one way signs only sign signs specific street signs white arrow black-on-white communicating communication directional gray grey indication no-alternative one-way one-way-signs pointer pointing reflective street-sign traffic traffic-flow traffic-sign ba1969 best cartoon drawing finger First hand illustration number one post UP way icon north point upward blue bright only direction pointing back traffic flow traffic sign age aged decay grunge Jerome left paint surface texture forbidden oneway pole posts prohibit prohibited red signpost signposts sky sundtraffic warning yellow arrows back color colors direction. down forward icons pijl position access advice announcement appearance declaration detail entrance entry informative informing lettering message notice notification surfaces welcome word baffle gate bags closed control covered exit faregate gate gates hooded hoods mass transit stations mass transit turnstiles movement control not used one-way people traffic passenger control passenger movement passengers pedestrian control railway station sealed turnstile turnstiles waist-high turnstiles divergent diverging splitting splitting-up turn turning two-way