I have had a couple friends who are university professors and went to Nigeria.

The road blocks are everywhere.

The corruption is amazing. One friend said that inside the airport, before entering the country an "official" said he had to pay 400 dollars in taxes to enter the country with all the cameras, lenses, videocamera, etc. After a short talk he gave the guy 20 dollars. Two hours latter in a roadblock the "soldiers" said he would have to pay taxes on his camera equipment...

The united nations FAO has a house (compound with 25 feet walls) near the airport so that no visitors (researchers, university professors and other invited guests, etc) will travel at night.