Formwork is a major contributor to profitability - or the lack of it- on most concrete jobs. The vehicular underpass tunnel at Detroit Metropolitan Airport is no exception. Recognizing this early-on, general contractor Walbridge Aldinger studied the bid documents and planned a job that would run with assembly-line efficiency. The task was formidable; more than 70,000 cubic yards of concrete was needed for the 1,528-foot-long tunnel, with a job cycle spanning two winters. Work was completed on schedule in the spring of 1993. Walbridge Aldinger's innovative forming and placing methods are providing helpful background information for the owner as design proceeds for a second similar tunnel at Detroit Metropolitan Airport.