I'm trying to publish a local street map with Illustrator and InDesign. My local maps have black and gray lines with black type, red highways and blue water (spot colors). When I import my Illustrator file into InDesign, it breaks down the gray lines and black type and puts them on all four color plates. I suppose it thinks these are colors instead of black and tints of black. Can anyone offer help on this? I'm sure the printer does not want to use four plates to print black.