access denied alternative black denied directions no standing no temporary parking not allowed not permitted parking permission denied prohibited prohibition red sign signs warning white black on white direction law no alternative one way one way signs only specific street signs arrows blue communicating communication directional divergent diverging indication no-alternative pointer pointing splitting splitting-up street-sign traffic traffic-flow traffic-sign turn turning two-way black-on-white gray grey left-turn reflective vehicles vehicular wording arrow one-way one-way-signs