Common sense 101 teaches that this can only be true after some point.

In the case of this particular "101", that point is not yet met. However, when the cost of 6.4 miles of single-lane is $72 million, it does get a bit pricey. [1]

They are planning to add another TOLL/HOV lane for most of the corridor, and open up the existing HOV to TOLL. You might get to drive it in 2018! But I don't see cost estimates for that one yet. [2]

[1] - http://www.vta.org/projects-and-programs/highway/us-101-auxi...

[2] - http://www.vta.org/projects-and-programs/highway/us-101-expr...

Curious, is the opposite true? Maybe we should drop the 101 down to one lane, and the speed limit to 25 for good measure? Then there would be practically no traffic at all, as everyone would avoid it like the plague. Problem solved!

/joking, obviously

So why does Pyongyang have huge highways and few drivers?