The National Weather Service says to expect freezing drizzle early this morning in a Special Weather Statement:
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
343 AM EST WED JAN 21 2015…AREAS OF FREEZING DRIZZLE EARLY THIS MORNING…
FREEZING DRIZZLE WAS OCCURRING EARLY THIS MORNING WITH TEMPERATURES HOVERING AT OR JUST BELOW FREEZING. THE FREEZING DRIZZLE COULD PERSIST INTO THE DAYLIGHT HOURS. ROADS…PARKING LOTS AND SIDEWALKS MAY BECOME SLICK THIS MORNING WITH A THIN COATING OF ICE. ELEVATED BRIDGES AND OVERPASSES WILL BE ESPECIALLY SUSCEPTIBLE TO ICY CONDITIONS. USE CAUTION WHILE DRIVING AND SLOW DOWN.