Of course then there's the community and economic benefit. A few days ago I drove down Grand River, where it runs parallel to I-96. Literally no businesses left except a gas station and a White Castle. Running I-96 traffic down Grand River would make the area hopping again.
If you take a look at the traffic volume map that was provided, Detroit's main roads [[Woodward, Fort, Gratiot, etc.) have traffic volumes pale in comparison to the freeways. You may have to widen a road here or there, but the volumes would stay manageable.
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