A slippery mess Tuesday morning on the southbound Northwest Expressway exit from Lake Hefner Parkway.
A car hit a patch of ice on the ramp and couldn't make it all the way to the top. It caused a traffic backup.
Then a semi jackknifed on the exit ramp and slid off the ramp.
The exit is closed until ODOT crews can sand the ramp and get the semi out of the way.