you need to understand that a brt system using roads will still be caught in traffic, unless it has a dedicated lane or is elevated.  bonds, virtual railways runs on roads so it is impractical here in Honolulu with so much traffic going in many directions.  any mass transit system not having a dedicated route will be slow and if using surface streets, it will cause more traffic.  creating a separate surface lane will still be very expensive as land will have to be condemned, displacing many people and businesses along the way.  entrance and exit ramps will have to be built, requiring more land for these ramps.  the devil is in the details, merely looking at something and saying it will work and save money is easy to say.