Light freezing drizzle quickly turned Tulsa's elevated roads into ice rinks late Wednesday morning. The Oklahoma Department of Transportation was called out to treat the expressway when temperatures dropped to 28 degrees and the drizzle started sticking to the roadways.
Bridges and overpasses were the worst, especially on I-244 west of Sheridan. Numerous wrecks were reported, including one involving two ambulances.
The National Weather Service issued a Winter Weather Advisory.