Daewoo Incheon Motor Co., which makes cars for South Korea's GM Daewoo Auto & Technology Co., started a two shift work system on Monday at one of its two production lines as demand for GM Daewoo vehicles grows, a GM Daewoo spokesman told Dow Jones Newswires. Introduction of the two shift operation brings Daewoo Incheon, which relies entirely on orders from GM Daewoo, closer to meeting conditions laid out by General Motors Corp. before it can once again become part of GM Daewoo, an affiliate of the US car giant, the report noted.