Einbahnstrasse old sign street traffic barrier closed control road warning car cars information post signs caution hazard roadwork slow workers workman workmen appropriate-behavior appropriate-behaviour black communicating communication denied directive discrimination exception exceptional exceptions informing limited limited-parking no-parking not-allowed not-permitted parking permission-denied prohibited prohibition red restricted restrictions road-sign roadside special-parking street-sign traffic-flow white advice alert announcement be-careful beware care careful concern crossing danger dangerous lookout observant pedestrians risk risks risky safety speed-reduction stop walk walkers walking warning-sign watch watch-out yellow give isolated triangle way attention deer germany pictogram