All this points to road surfaces remaining wet in central OK throughout the duration of the freezing rain event.
Now the exposure of elevated roads paint a different story. The reservoir of heat will be eroded from multiple sides, allowing the surface to potentially reach a little below the melting point and allowing the potential for falling rain to freeze. Bridges and overpasses could become slick if untreated. But this event is well-forecast and hopefully the OKDOT attacks elevated surfaces before precipitation starts. Since the NWS forecasts the potential for hazards to occur, they can't depend on knowing for sure what our efforts of mitigation may entail and thus pay heed to these graphics below.
The bottom line is that elevated surfaces may become slick, if untreated in central OK while colder air could be sufficient for all untreated roads in NW OK.
Ice will accumulate on all trees, power lines in central and NW OK. However NW OK is most likely to bear the brunt of the heaviest rainfall. Three quarter to one inch accumulation of ice will cause power outages there, and into Kansas and adjacent Missouri. While this storm will not likely be equivalent to the catastrophic ice events of the past 16 years, it'll be bad enough.