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In a more remote areas (or less visited) you must be exceptionally lucky to get a free lift as the only mean of transport is a shared taxi.You do get very cheap buses travelling long distances, however be very aware of "swahili time" if you do end up booking a bus. This is a different form of counting time which starts 00:00 at sunrise. Therefore 11 in the morning might mean 5am. Food is amazingly cheap and most people very hospitable, especially if you're quite obviously a traveller from a different country.It's worth learning some Swahili as aside from the largest cities, you won't find very much English. You will also probably encounter a million greetings a day and it's lovely to be able to reply with the correct answer! Mostpeople's first language is their tribal language, and Swahili is the language which unites everyone.  Be careful of travelling by yourself as a woman. Normally you may just get chatted up for your exotic look, but keep your own safety in mind. Tanzania outside of the big cities is quite conservative, and often old school Christian or Islamic. It makes sense to cover up reasonably, which is helpful anyway for the heat!