When I grew up in Houston the I-45 was being built, I went to elementary school, high School it was being built, went off to the Army, got married, it was still being built, live out of state, come back, it went on and on and on, now you say they never stop working on it, it is the short road that is never completed.
That has always mystified me as well. What, besides corruption of some kind, could possibly explain it?