ban banned entry human illegal man no prohibit prohibition road roadsign sign signs tresspass warning woman alert forbidden plate prohibited street traffic transport way bend caution cutout isolated left right roadsigns sharp turn turning danger deer hazard ice rural snow triangle boy cow crossing road Hanoi looking taking care Vietnam crossing crossover crosswalk pedestrian public safety zebra child mother path pedestrians walk asphalt autumn clouds colors colours country crops field fields green horizon nature sky spring travel yellow advice announcement appropriate-behavior appropriate-behaviour be-careful beware black care careful communicating communication concern dangerous information informing lookout observant red risk risks risky road-sign security share sharing speed-reduction stop street-sign traffic-flow walkers walking warning-sign watch watch-out