Generate a monochrome image of Cement Mixers for a coloring book that is appropriate for ages 12 and up. The image should be a full-length view of a powerful and detailed construction vehicle (such as a crane, bulldozer, or front-end loader) parked by an active construction site. The background should feature bustling construction scenes, perhaps including a city skyline under construction. The image should not contain any shading but should be highly detailed to provide an engaging and intricate coloring experience. The style should be clear and outlined, with distinct areas to color, and the subject should be complex enough to maintain the interest of older children and adults. Add an American cityscape backdrop, displaying the high complexity of design, intricate patterns, or designs, and a high difficulty level. Please ensure the image is in a high resolution suitable for printing ar 8:11