Iringa Transportation

Generally flying to Tanzania is the easiest way of getting there unless you're on some major safari through africa and happen to be driving.
Once there, you can get around on the buses which go between towns. Don't fool yourself by getting a picture in your mind of a luxury coach - it's far from that! The journeys are normally long as a lot of the roads are not in very good condition and the vehicles driven are overloaded.

I suppose you could get a charatered flights from Dar es Salaam to some more popular or isolated areas.