The whole Hall Road thing is so stupid that I have an alternative theory for it:

1) You say you are going to do it to make the system seem more regional.

2) Once you get the RTA, you do an actual study showing that no one will ride a Hall Road line and that the dedicated bus lanes will screw up traffic.

3) You bow to public outcry and don't build it.

However, I'm not sure anyone playing this game is actually thinking that far ahead.