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Tunnels aren't a perfect solution.
1. Construction cost is MUCH higher than above-ground.
2. Water. In low areas like Houston, anything deeper than 8 ft or so requires full-time pumps to keep it dry. That's not free.
3. Driver sanity. I would go insane driving underground for more than a few miles.
Building a solar-collecting roof over the road would still be cheaper than tunneling, and provide some of the same benefits - power generation and cool road surface.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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