I think the government shouldn't pay for roads... they should pay for much more efficient forms of transportation like trains, buses, and bicycle infrastructure.

Because they don't want any peasants and serfs creating traffic for the 1% trying to get around ok?

Tolls are good actually

Old workplace had its head office in Brisneyland (we're in melbs) and every damned time I was up there for a training junket I ended up in a car full of screaming coworkers, taking tunnel after tunnel and desperately clawing at google maps trying to figure out when the fuck we entered the tenth circle of hell because there are ten circles, not nine, the tenth is the one where you’re trying to get from The Circuit to the CBD in peak traffic while crammed in a tiny rental car with several large men who have just come off a 4 hour flight.

For convenience.

If it is high speed road or special infrastructure, it make sense.
The faster you go, the exponentially higher forces are put on the road, that means it is going to be very expansive to maintain. Instead of putting that extra maintenance on everybody, is put only to those who decides to use the road infrastructure.

If you do it very very wrong I suppose

I have watched Daylight far too many times. I'm not a fan of the tunnels.