Columbus FINALLY has the highway system it needed in 1965. Too bad it isn't 1965 NOW though...
Honestly the issue is how many layers of planning there are, so many agencies and bureaus are involved at that level. The Interstate system could not be built today...We owe a LOT to Eisenhower riding a CCKW down the Autobahn in 1945!
Us old guys can remember how bad it used to be. 315 through town was INSANE, lots of bends because of how the old Spring/Sandusky interchange was incorporated. They straightened it in the 90s, eliminated a few ramps, and now it moves relatively decent.
The 256 exit used to back up all the way to Brice starting about 3pm EVERY day. Put a wreck in, and it wasn't uncommon to have cars back to HAMILTON. Pickerington was maybe 25% the size it is now, and there was NOTHING at that interchange but a couple gas stations. Sawmill was the same way. Roberts used to take me 25 minutes to get from the tracks to the freeway.
It's what happens with the traffic AFTER it exits the freeway that fucks everything up. And all it really takes to solve a lot of those problems are flyover exits, dedicated forced exit lanes, getting rid of the grassy medians, and the total elimination of the goddamn C-weave!