An overturned tractor-trailer is causing traffic delays in northwest Oklahoma City.
The crash happened about 4:30 a.m. Thursday at the eastbound NW 39th on-ramp to eastbound Interstate 44.
The southbound Lake Hefner Parkway ramp to eastbound I-44 is also closed due to the crash.
The closures are expected to last into mid-morning.
Motorists are asked to avoid the area and plan an alternative route if possible.