A hundred mil a mile. Nice ripoff.
I-10 was widened —. NOT built from scratch — for about 3-4 years in staggered construction time about 2002 - 2005/6. This was west of downtown Houston by east of Katy.
Two contracts were let then. About 2.1 to 2.2 miles each.
150 $ million per contract in round numbers.
75 $ million per mile.
No bridges / just overpasses. On tabletop flat land.
And about 15+ years ago.