Ключевые слова: advice, alert, attention, australia, board, car, cars, changeable, community, covid safe, covid test, covid19, danger, disease, distancing, drive, dynamic, electronic, get tested, information, keep distance, lockdown, outbreak, outdoor, pandemic, precaution, road, road sign, sign, sign board, social distance, stay alert, stay alert sign, stay safe, street, sydney, town, traffic, transport, transportation, urban, vehicle, vehicles, virus, warning, warning sign,