call communication hear phone pictogram sign speak symbol talk telephone boy cow crossing road Hanoi looking taking care Vietnam crossing crossover crosswalk pedestrian public road safety street zebra ban beware prohibition red round swim swimming warning water child mother path pedestrians roadsign walk high hill scenary ski skiing sky snow snowy winter disabled handicap handicapped parking pavement wheelchair board cutout information isolated old post rust rusty europe flag mast national nordic norway norwegian scandinavia danger digger drive excavator security traffic travel vehicle yellow animal sheep