I see zero benefit to the Highland light rail route, be it bridge, long or short tunnel. Future airport access is not mean it will ever happen. There is a current dedicated bus route for the airport, secondly a extended freeway will hopefully make it faster. Who is it for? ACC students?
The people should vote NO to the Highland proposal and scream and kick fighting for the North Corridor project, about as much money and it would impact so many more people helping them get to downtown and eventually relieve some traffic on I35.
See this, I found it interesting, not that I want to be packed in like that but some form adapted to Austin would be nice: http://www.streetfilms.org/bus-rapid-transit-bogota/