In article , John Rowland
writes
I would imagine that the cost of the rails is a small fraction of the
project cost, so your bus lanes would be nearly as expensive as the tram
line.

The cost of the rails themselves might be quite low, but there's a major
cost in diverting all services (phone, gas, water, etc.) from out of the
line of route. A bus lane doesn't have this problem, because you just
divert the buses into traffic when you need to dig up the lane.

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