article_snippet: Each hand on the odd-looking machines - built to withstand the year-round hot climate - is fitted with green and red lights that regulate the flow of traffic in the sprawling city of nine million.
article_snippet: Each hand on the odd-looking machines - built to withstand the year-round hot climate - is fitted with green and red lights that regulate the flow of traffic in the sprawling city of nine million .
highlights_snippet: Each hand is fitted with green and red lights that regulate flow of traffic .
  