The 50 millionth vehicle crosses the Mackinac Bridge
World's first unrestricted, public-use microwave landing system begins operating at Wexford County Airport in Cadillac
MDOT institutes "smiley-face" road signs in construction zones
Nation's largest concrete segmental bridge opens - Zilwaukee Bridge carrying I-75 over the Saginaw River.
MDOT takes computers to construction field offices for the first time when it implements the Construction Project Record Keeping System (CPRKS).