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 advice alert appropriate-behavior appropriate-behaviour cars clearway communicate communication danger dangerous information informing keep-clear law legal no-parking no-standing no-temporary-parking not-allowed not-permitted permission-denied refusal restricted restriction restrictions risk risks risky road road-safety road-side safety unacceptable vehicles warning-sign access-denied care caution signage