Entry into Senegal through Djalma:
From May 2015, no visa is required for Senegal.
At the Senegalese side, 10 euros are required to pay for the toll to cross the bridge between Mauritania and Senegal.
The police also asked us for about 5 euros to be processed at entry.
When you enter Senegal, there will be a lot of pressure to buy some car insurance. You will be sent to talk to somebody for that purpose. This car insurance agent will not wear any uniform and will not work for the government. No government official will sell you any car insurance (this is different than in Mauritania, where it will be a government official who sells you the insurance to travel through Mauritania). We had read we were supposed to get the 'carte brun', which is accepted in most Western African countries. The guy in the car insurance tent on the Senegalese side of the border, insisted the carte brun was valid only in a couple of countries. We ended up buying some insurance that supposedly was valid in most Western Africa. We paid 50 euros for two motnhs. We only were asked once in Senegal to show this proof of insurance. After Senegal, whenever a police officer was looking to get some money from us (bribe), he will ask us for our car insurance. We will show him the insurance we bought in Senegal and he will say it is 'no good'. Then we will show our European insurance, and he will say again it is 'no good'. At that point we will reply: "of course it is good, it an international insurance, he has been accepted in the countries we have gone through". When the police officer sees that you are not scared, but rather certain your paperwork is all correct, and, moreover, you have no intention to offer him some money to sort out the problem, he will let you go. That happened to us many times, even if our paperwork was not quite correct (they just did not know, only we did!).
In Senegal the 'carnet de passage' is required. You need to go to Dakar within 48 hours to get the entry stamp. Somebody offered some help guiding us through the customs building in the port. Then, he asked us for a stupid amount of money. We did not pay anything. You are not supposed to pay anything for the carnet the passage entry and exit stamps.