I don't know a lot about the background of this project or the region. Why has it taken this long for a tunnel to be built in LV? Was/is it not considered necessary?
It's not comparable to real mass transit systems used on the scale of a city and the length of the tunnel means that the public really can't view the cost of this as comparable to the cost of a real Subway system tunnel or road tunnel.
The relevance of the project for TBC is that they're going to learn from it, but for the rest of us it's really not going to be that interesting.