Ключевые слова: 30, ahead, alert, area, attention, background, board, build, car, caution, construction, construction site, damaged, danger, equipment, front, information, leafs, limit, maintenance, many, place of work, progress, red, restriction, road, road sign, road sign warning, roadwork, safety, scratched, security, sign, site, speed, speed limit, speed limit working area, stop, street, symbol, traffic, traffic sign, transport, transportation, triangle, under, warning, work, working area speed, yellow,