New York City Mayor Michael Bloomberg unveiled a contingency plan if transit workers strike, requiring all cars to carry at least four people to enter or leave Manhattan, reported the Associated Press. The car occupancy requirements would take effect if the Transport Workers Union strikes when its city contract expires Dec. 15. Union members voted Saturday to authorize a strike if talks with the Metropolitan Transportation Authority, the largest public transit system in the nation, don't produce a deal, said the AP. The union has asked for a 24% wage increase over three years. A walkout by subway and bus workers would cost the city from $100 million to $350 million per day, Bloomberg said Monday.