horse horse-drawn carriage indonesia indonesian transportation pajajaran kingdom sundanese transportation west java province anti aircraft army detection electromagnetic equipment germany military peace radar Riese security war waves Wurzburg antenne advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware black care careful caution communicating communication concern danger dangerous directions informing Look looking lookout observant red risk risks safety sign signs warning warning-sign watch watch-out white blue children kids slow slow-down slower carpark pedestrian pedestrian-speed reflective shared-area speed traffic