VIDEO: Cars flew down Interstate 39/90 without a problem Thursday afternoon, but fire departments along the highway are concerned about getting to the scene of a crash when traffic backs up in the construction zone. The Wisconsin Department of Transportation is expanding about 45 miles of I-39/90 from the Illinois state line to the Beltline in Madison. During construction, lanes are narrowed and there’s barely any shoulder in certain parts, which creates a problem when emergency responders are fighting traffic to get to the scene of a crash.