Originally Posted by Endurorally
Why not get the visa before you leave? Surely that would be a lot less worry and hassle?
In theory, you need 15 prior visas for a Transafrica trip. In practice, you need only 1 or 2 (Nigeria, Gabon)!
Now, if you are a theoretic, your passport will go from one embassy to the next in your capital city for 15 weeks and you will fill out 15 forms and try to get 10 invitation letters. You will pay a visa agency to do the running. In addition you will need a second passport for your other travels while the first one makes the embassy tour. More often than not, your home country is the most difficult place to get the visa!
If you are a practicioner, you will learn that border guards can turn you away even if you have the visa "before you leave". And you will learn to get the Visa On Arrival without problems, in most countries.
The same logic applies to the Carnet de Passage. Rarely needed.
And for Travel Warnings. Rarely relevant.
All three are imaginations of bureaucrats who feed off a system that - fortunately - rarely passes the reality check. But most people don't find out about this little secret - because they "worry" ...