cannon circle conflict enemy mandatory peace politics prohibitory red road roadsign roadsigns sign signs tank traffic war warning wars board cross crossroads direction directions pedestrian roads signboard street be-prepared to stop caution hazard readiness ready road-sign roadwork slow slow-down workers workman workmen calming England english Great Britain hedge norfolk rural signage traditional beware bus car danger drive safety security transportation travel vehicle yellow church instruction lot no not park parking shalt thou allowed cars driving overtake overtaking blue city crossing man plain townurban walk zebra alert back ban banned entry exit go plate prohibited transport way ahead construction orange square sundtraffic us usa work diversity exception grunge grungy Israel Jerusalem language prohibition