Drones can already be somewhat autonomous in flying as it is, and flying cars likely will just be scaled up drones. I can see it happening just as soon as, if not sooner than, autonomous driving cars.
A flying car big enough to hold one or more people along with some cargo (or stuff bought while shopping) is far more complicated a matter than a drone only big enough to deliver a package from Amazon.
Again, I repeat the extremely important factor of
safety. "Flying cars" aren't going to be any kind of automatic
plug-and-play vehicle. Training and licensing for those vehicles will likely be very different from that of standard motor vehicle licenses. Anyone using those vehicles may need something more akin to a pilot's license. Insurance will be far different and likely more costly. Maintenance and safety inspection standards will have to be far higher than that of traditional motor vehicles.
Even with all the rules and regulations one would expect to be in place human nature remains a wild card. Regardless if a flying car is automated the "pilot" will have to constantly pay attention in case he needs to manually take control. Semi-autonomous electric vehicles make up a very small percentage of vehicles currently on the road. Yet there are lots of stories of people crashing their Teslas while doing stupid things behind the wheel.
I had read there are rumors Sen. Inhofe is retiring very soon. In the past the legislature is specifically issued bonds for ODOT to use. I wonder if Inhofe will do anything to expedite this before his retirement. . .
It looks like any efforts to upgrade US-412 into a named Interstate highway between I-35 and I-49 are not related at all to the OTA's Access Oklahoma 15-year plan. Inhofe has some clout with making deals related to highway projects. It's possible he may focus on the US-412 project. However, he is getting pretty old and his wife has had health issues, pulling him away from some of his duties.