My thought ages ago was to make tunnels. Roadways concealed. I would only think Turnpikes, or specific road ways would be this way.
It may seem daft at first, but I was thinking this way:
-Close to no maintenance for winter. No salt needed, no plows needed.
-Close to no rebuild from winter damage, since little salt and no plows.
-No deer accidents.
-Always light- LED for night, glass and LEDs for day.
-Decreased air resistance while traveling.
-No cross winds.
-Solar panel space on the top.
-Pollution could then be filtered.
And my favorite?
VERTICAL wind turbines!
They go in the center. As the cars are going opposite directions, there would be a lot of force on these. Yes, initial cost would be there. BUT, this would be a road worth driving on- with very little upkeep, and much better for the vehicles. Imagine if the commute most people had had far less air resistance, created power, and the fumes could be pulled up through simple fans to be filtered.
I won't waste money to drive on the road that is just like any other. But a road like that, I'd spend money on it lol.
I would think the government would love it, since it would be extremely easy to monitor with cameras or even just sensors to track vehicle speeds.
"Sir, our system clocked you exceeding 9 mph 6 times on your trip. That's 6 citations for you. Have a good day!"